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Miss Chen
2 hours ago
Miss Chen
虫害危害 网蝽科中有许多种类是树木、果树和经济作物的害虫,较重要的有:膜肩网蝽和小板网蝽为害杨树,角菱背网蝽为害泡桐,茶脊冠网蝽为害茶树,樟脊冠网蝽为害樟树,梨冠网蝽(Stephanitis nashi Esaki et Takeya)为害梨和桃、苹果等其他蔷薇科果树,香蕉冠网蝽为害香蕉。 泡桐网蝽成、若虫均能为害,主要在叶背吸食汁液,被害叶片正面形成苍白点,背面有褐色斑点状虫粪及分泌物,发生严重的叶片变褐反卷脱落,嫩枝枯死,甚至整株死亡。


虫害形态特征 成虫 体长4.0-4.8毫米,宽2.5毫米左右,体黄褐色,扁平状。触角4节,黑褐色,第3节细长,第4节略膨大;头顶背面正中有一对弧状隆起。前胸背板近似菱形,前端平,两侧角尖锐,后端呈等边三角形,背板中央有一条纵隆脊,可伸达三角突的末端;前端近前缘处有两个近长方形的黑斑;背板上布满深褐色刻点。前翅淡黄褐色或灰黄色。翅端圆钝,翅面上有很多网状纹。前缘脉呈圆弧状,后翅稍短于前翅,烟黄色,靠近翅脉处具兰色闪光。雄虫腹部黄褐色,色泽较重,第8节近三角形。足,黄褐色,较细长,跗节第1节末端有两个勾形爪,中间有1个垫。 卵 白色,长椭圆形,中间有1个小黑点。 若虫 共6龄,长0.6-0.7毫米,宽0.2-0.3毫米,初孵化时白色透明,后渐变为清黄色,长条形。 虫害发生规律 泡桐网蝽1年发生3代,有世代重叠现象。以成虫在泡桐基部地面1-4cm深处或向阳面的皮缝内越冬。翌年3月下旬越冬成虫活动,4月上旬吸食幼嫩叶片汁液, 5月上旬开始产卵。第一代卵历期7-8天,第2、3代卵历期4-5天。第一代若虫于5月中旬出现,6月上旬为盛期,第2代若虫出现盛期在7月上旬,8月中旬为第三代幼虫出现盛期。6月中旬出现第1代成虫,6月下旬为盛期,第3代成虫寿命最长,达230天左右。第3代成虫于10月中旬以后陆续停止取食,进入越冬期。成虫羽化5-7天后开始交尾,交尾后3-5天开始产卵,将卵产于叶背面的侧脉上,也有少量卵产在主脉梢头或散产在叶面上有孔洞边缘的叶肉内。雌成虫较雄成虫早羽化3-4天。成虫较敏感,受惊后立即转移,有假死性。成虫、若虫多群集在叶背靠近叶柄的叶脉处取食危害。7-8月为危害盛期,品种间抗虫性有差异,其中兰考桐叶片受害率高,秋叶桐和毛泡桐较抗虫。泡桐网蝽主要靠苗木、原木运输,向远距离扩散蔓延。 虫害防治方法 (1)保护和利用天敌。 (2)因地制宜的选择较抗虫品种。 (3)加强栽培管理,增强树势,提高抵抗力。及时清理落叶、杂草并集中烧毁,减少虫源。 (4)严格检疫,避免从疫区引进苗木。 (5)成、若虫发生期,树干基部注射50%甲胺磷原液或40%久效磷1:1稀释液。在4月下旬至5月中旬,用2.5%溴氰菊酯3000-5000倍液喷洒叶面进行防治。
虫害危害

网蝽科中有许多种类是树木、果树和经济作物的害虫,较重要的有:膜肩网蝽和小板网蝽为害杨树,角菱背网蝽为害泡桐,茶脊冠网蝽为害茶树,樟脊冠网蝽为害樟树,梨冠网蝽(Stephanitis nashi Esaki et Takeya)为害梨和桃、苹果等其他蔷薇科果树,香蕉冠网蝽为害香蕉。 

泡桐网蝽成、若虫均能为害,主要在叶背吸食汁液,被害叶片正面形成苍白点,背面有褐色斑点状虫粪及分泌物,发生严重的叶片变褐反卷脱落,嫩枝枯死,甚至整株死亡。
      虫害形态特征

成虫
体长4.0-4.8毫米,宽2.5毫米左右,体黄褐色,扁平状。触角4节,黑褐色,第3节细长,第4节略膨大;头顶背面正中有一对弧状隆起。前胸背板近似菱形,前端平,两侧角尖锐,后端呈等边三角形,背板中央有一条纵隆脊,可伸达三角突的末端;前端近前缘处有两个近长方形的黑斑;背板上布满深褐色刻点。前翅淡黄褐色或灰黄色。翅端圆钝,翅面上有很多网状纹。前缘脉呈圆弧状,后翅稍短于前翅,烟黄色,靠近翅脉处具兰色闪光。雄虫腹部黄褐色,色泽较重,第8节近三角形。足,黄褐色,较细长,跗节第1节末端有两个勾形爪,中间有1个垫。 

卵
白色,长椭圆形,中间有1个小黑点。 

若虫
共6龄,长0.6-0.7毫米,宽0.2-0.3毫米,初孵化时白色透明,后渐变为清黄色,长条形。 

虫害发生规律

泡桐网蝽1年发生3代,有世代重叠现象。以成虫在泡桐基部地面1-4cm深处或向阳面的皮缝内越冬。翌年3月下旬越冬成虫活动,4月上旬吸食幼嫩叶片汁液, 5月上旬开始产卵。第一代卵历期7-8天,第2、3代卵历期4-5天。第一代若虫于5月中旬出现,6月上旬为盛期,第2代若虫出现盛期在7月上旬,8月中旬为第三代幼虫出现盛期。6月中旬出现第1代成虫,6月下旬为盛期,第3代成虫寿命最长,达230天左右。第3代成虫于10月中旬以后陆续停止取食,进入越冬期。成虫羽化5-7天后开始交尾,交尾后3-5天开始产卵,将卵产于叶背面的侧脉上,也有少量卵产在主脉梢头或散产在叶面上有孔洞边缘的叶肉内。雌成虫较雄成虫早羽化3-4天。成虫较敏感,受惊后立即转移,有假死性。成虫、若虫多群集在叶背靠近叶柄的叶脉处取食危害。7-8月为危害盛期,品种间抗虫性有差异,其中兰考桐叶片受害率高,秋叶桐和毛泡桐较抗虫。泡桐网蝽主要靠苗木、原木运输,向远距离扩散蔓延。 

虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种。 

(3)加强栽培管理,增强树势,提高抵抗力。及时清理落叶、杂草并集中烧毁,减少虫源。 

(4)严格检疫,避免从疫区引进苗木。 

(5)成、若虫发生期,树干基部注射50%甲胺磷原液或40%久效磷1:1稀释液。在4月下旬至5月中旬,用2.5%溴氰菊酯3000-5000倍液喷洒叶面进行防治。
虫害危害

网蝽科中有许多种类是树木、果树和经济作物的害虫,较重要的有:膜肩网蝽和小板网蝽为害杨树,角菱背网蝽为害泡桐,茶脊冠网蝽为害茶树,樟脊冠网蝽为害樟树,梨冠网蝽(Stephanitis nashi Esaki et Takeya)为害梨和桃、苹果等其他蔷薇科果树,香蕉冠网蝽为害香蕉。 

泡桐网蝽成、若虫均能为害,主要在叶背吸食汁液,被害叶片正面形成苍白点,背面有褐色斑点状虫粪及分泌物,发生严重的叶片变褐反卷脱落,嫩枝枯死,甚至整株死亡。
      虫害形态特征

成虫
体长4.0-4.8毫米,宽2.5毫米左右,体黄褐色,扁平状。触角4节,黑褐色,第3节细长,第4节略膨大;头顶背面正中有一对弧状隆起。前胸背板近似菱形,前端平,两侧角尖锐,后端呈等边三角形,背板中央有一条纵隆脊,可伸达三角突的末端;前端近前缘处有两个近长方形的黑斑;背板上布满深褐色刻点。前翅淡黄褐色或灰黄色。翅端圆钝,翅面上有很多网状纹。前缘脉呈圆弧状,后翅稍短于前翅,烟黄色,靠近翅脉处具兰色闪光。雄虫腹部黄褐色,色泽较重,第8节近三角形。足,黄褐色,较细长,跗节第1节末端有两个勾形爪,中间有1个垫。 

卵
白色,长椭圆形,中间有1个小黑点。 

若虫
共6龄,长0.6-0.7毫米,宽0.2-0.3毫米,初孵化时白色透明,后渐变为清黄色,长条形。 

虫害发生规律

泡桐网蝽1年发生3代,有世代重叠现象。以成虫在泡桐基部地面1-4cm深处或向阳面的皮缝内越冬。翌年3月下旬越冬成虫活动,4月上旬吸食幼嫩叶片汁液, 5月上旬开始产卵。第一代卵历期7-8天,第2、3代卵历期4-5天。第一代若虫于5月中旬出现,6月上旬为盛期,第2代若虫出现盛期在7月上旬,8月中旬为第三代幼虫出现盛期。6月中旬出现第1代成虫,6月下旬为盛期,第3代成虫寿命最长,达230天左右。第3代成虫于10月中旬以后陆续停止取食,进入越冬期。成虫羽化5-7天后开始交尾,交尾后3-5天开始产卵,将卵产于叶背面的侧脉上,也有少量卵产在主脉梢头或散产在叶面上有孔洞边缘的叶肉内。雌成虫较雄成虫早羽化3-4天。成虫较敏感,受惊后立即转移,有假死性。成虫、若虫多群集在叶背靠近叶柄的叶脉处取食危害。7-8月为危害盛期,品种间抗虫性有差异,其中兰考桐叶片受害率高,秋叶桐和毛泡桐较抗虫。泡桐网蝽主要靠苗木、原木运输,向远距离扩散蔓延。 

虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种。 

(3)加强栽培管理,增强树势,提高抵抗力。及时清理落叶、杂草并集中烧毁,减少虫源。 

(4)严格检疫,避免从疫区引进苗木。 

(5)成、若虫发生期,树干基部注射50%甲胺磷原液或40%久效磷1:1稀释液。在4月下旬至5月中旬,用2.5%溴氰菊酯3000-5000倍液喷洒叶面进行防治。
虫害危害

网蝽科中有许多种类是树木、果树和经济作物的害虫,较重要的有:膜肩网蝽和小板网蝽为害杨树,角菱背网蝽为害泡桐,茶脊冠网蝽为害茶树,樟脊冠网蝽为害樟树,梨冠网蝽(Stephanitis nashi Esaki et Takeya)为害梨和桃、苹果等其他蔷薇科果树,香蕉冠网蝽为害香蕉。 

泡桐网蝽成、若虫均能为害,主要在叶背吸食汁液,被害叶片正面形成苍白点,背面有褐色斑点状虫粪及分泌物,发生严重的叶片变褐反卷脱落,嫩枝枯死,甚至整株死亡。
      虫害形态特征

成虫
体长4.0-4.8毫米,宽2.5毫米左右,体黄褐色,扁平状。触角4节,黑褐色,第3节细长,第4节略膨大;头顶背面正中有一对弧状隆起。前胸背板近似菱形,前端平,两侧角尖锐,后端呈等边三角形,背板中央有一条纵隆脊,可伸达三角突的末端;前端近前缘处有两个近长方形的黑斑;背板上布满深褐色刻点。前翅淡黄褐色或灰黄色。翅端圆钝,翅面上有很多网状纹。前缘脉呈圆弧状,后翅稍短于前翅,烟黄色,靠近翅脉处具兰色闪光。雄虫腹部黄褐色,色泽较重,第8节近三角形。足,黄褐色,较细长,跗节第1节末端有两个勾形爪,中间有1个垫。 

卵
白色,长椭圆形,中间有1个小黑点。 

若虫
共6龄,长0.6-0.7毫米,宽0.2-0.3毫米,初孵化时白色透明,后渐变为清黄色,长条形。 

虫害发生规律

泡桐网蝽1年发生3代,有世代重叠现象。以成虫在泡桐基部地面1-4cm深处或向阳面的皮缝内越冬。翌年3月下旬越冬成虫活动,4月上旬吸食幼嫩叶片汁液, 5月上旬开始产卵。第一代卵历期7-8天,第2、3代卵历期4-5天。第一代若虫于5月中旬出现,6月上旬为盛期,第2代若虫出现盛期在7月上旬,8月中旬为第三代幼虫出现盛期。6月中旬出现第1代成虫,6月下旬为盛期,第3代成虫寿命最长,达230天左右。第3代成虫于10月中旬以后陆续停止取食,进入越冬期。成虫羽化5-7天后开始交尾,交尾后3-5天开始产卵,将卵产于叶背面的侧脉上,也有少量卵产在主脉梢头或散产在叶面上有孔洞边缘的叶肉内。雌成虫较雄成虫早羽化3-4天。成虫较敏感,受惊后立即转移,有假死性。成虫、若虫多群集在叶背靠近叶柄的叶脉处取食危害。7-8月为危害盛期,品种间抗虫性有差异,其中兰考桐叶片受害率高,秋叶桐和毛泡桐较抗虫。泡桐网蝽主要靠苗木、原木运输,向远距离扩散蔓延。 

虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种。 

(3)加强栽培管理,增强树势,提高抵抗力。及时清理落叶、杂草并集中烧毁,减少虫源。 

(4)严格检疫,避免从疫区引进苗木。 

(5)成、若虫发生期,树干基部注射50%甲胺磷原液或40%久效磷1:1稀释液。在4月下旬至5月中旬,用2.5%溴氰菊酯3000-5000倍液喷洒叶面进行防治。
虫害危害

网蝽科中有许多种类是树木、果树和经济作物的害虫,较重要的有:膜肩网蝽和小板网蝽为害杨树,角菱背网蝽为害泡桐,茶脊冠网蝽为害茶树,樟脊冠网蝽为害樟树,梨冠网蝽(Stephanitis nashi Esaki et Takeya)为害梨和桃、苹果等其他蔷薇科果树,香蕉冠网蝽为害香蕉。 

泡桐网蝽成、若虫均能为害,主要在叶背吸食汁液,被害叶片正面形成苍白点,背面有褐色斑点状虫粪及分泌物,发生严重的叶片变褐反卷脱落,嫩枝枯死,甚至整株死亡。
      虫害形态特征

成虫
体长4.0-4.8毫米,宽2.5毫米左右,体黄褐色,扁平状。触角4节,黑褐色,第3节细长,第4节略膨大;头顶背面正中有一对弧状隆起。前胸背板近似菱形,前端平,两侧角尖锐,后端呈等边三角形,背板中央有一条纵隆脊,可伸达三角突的末端;前端近前缘处有两个近长方形的黑斑;背板上布满深褐色刻点。前翅淡黄褐色或灰黄色。翅端圆钝,翅面上有很多网状纹。前缘脉呈圆弧状,后翅稍短于前翅,烟黄色,靠近翅脉处具兰色闪光。雄虫腹部黄褐色,色泽较重,第8节近三角形。足,黄褐色,较细长,跗节第1节末端有两个勾形爪,中间有1个垫。 

卵
白色,长椭圆形,中间有1个小黑点。 

若虫
共6龄,长0.6-0.7毫米,宽0.2-0.3毫米,初孵化时白色透明,后渐变为清黄色,长条形。 

虫害发生规律

泡桐网蝽1年发生3代,有世代重叠现象。以成虫在泡桐基部地面1-4cm深处或向阳面的皮缝内越冬。翌年3月下旬越冬成虫活动,4月上旬吸食幼嫩叶片汁液, 5月上旬开始产卵。第一代卵历期7-8天,第2、3代卵历期4-5天。第一代若虫于5月中旬出现,6月上旬为盛期,第2代若虫出现盛期在7月上旬,8月中旬为第三代幼虫出现盛期。6月中旬出现第1代成虫,6月下旬为盛期,第3代成虫寿命最长,达230天左右。第3代成虫于10月中旬以后陆续停止取食,进入越冬期。成虫羽化5-7天后开始交尾,交尾后3-5天开始产卵,将卵产于叶背面的侧脉上,也有少量卵产在主脉梢头或散产在叶面上有孔洞边缘的叶肉内。雌成虫较雄成虫早羽化3-4天。成虫较敏感,受惊后立即转移,有假死性。成虫、若虫多群集在叶背靠近叶柄的叶脉处取食危害。7-8月为危害盛期,品种间抗虫性有差异,其中兰考桐叶片受害率高,秋叶桐和毛泡桐较抗虫。泡桐网蝽主要靠苗木、原木运输,向远距离扩散蔓延。 

虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种。 

(3)加强栽培管理,增强树势,提高抵抗力。及时清理落叶、杂草并集中烧毁,减少虫源。 

(4)严格检疫,避免从疫区引进苗木。 

(5)成、若虫发生期,树干基部注射50%甲胺磷原液或40%久效磷1:1稀释液。在4月下旬至5月中旬,用2.5%溴氰菊酯3000-5000倍液喷洒叶面进行防治。
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Miss Chen
2 hours ago
Miss Chen
虫害危害 以若虫群集嫩梢、嫩叶吸食汁液为害,受害嫩枝流出褐色粘液,逐渐萎缩,停止生长。嫩叶受害后,出现褐色小点,导致叶片萎缩不能正常展开,或展开后在斑点处破裂。
虫害形态特征 成虫 体长3.5-4.2毫米,体狭长,黄褐色或灰褐色,形似大蚊。头顶圆鼓,向前伸。头部至胸部腹面呈黑色纵纹。触角褐色细长,第1节端部膨大,第4节纺锤形;末端为白色,各节具黑色环纹。黄色喙,伸达后胸足基节之间。前胸背板发达,向上隆起,具粗糙点刻,后缘中央及侧角上有3个显著的圆锥形突起。小盾片弯曲呈直立长刺。后胸两侧各具一个向后弯曲的长刺。足细长,其上具黑色环纹,各足腿节顶端膨大呈棒状。前翅黄白色,膜质透明,有紫色闪光。腹部纺锤形,黄绿色,背面具黑色斑块。 卵 长0.6毫米,宽0.2毫米,长椭圆形,顶端有两个突起,表面有纵行刻纹,乳白色至黄白色。 若虫 共5龄。老龄幼虫体黄绿色,细长,腹部中间膨大,端部尖细,稍向背上翘起,末端黑色。触角和足细长,各节上均具黑色轮纹。翅芽泡状,末端灰黑色。 虫害发生规律 娇驼跷蝽有世代重叠现象,1年发生3代。以第3代成虫在苗圃、林地附近地埂、杂草和落叶下越冬。翌年4月上旬开始活动,泡桐发芽后取食幼芽嫩叶危害。成虫在夜间羽化,5-7天即行交配。成虫不活泼,较稳定,严重受惊逃飞苗下,多在均在苗木上部的大片叶子背面取食活动,中部次之。4月开始产量卵,卵单粒,将卵散产于植株上部叶子背面主侧脉间的毛茸中,或背面边缘处。刚孵化的若虫在叶柄附近栖息。2龄若虫较活泼,多集中在苗木幼嫩梢的顶端或嫩叶上取食,3龄后稍有分散,可在叶子、叶柄上等处活动。4月上旬越冬代成虫飞到泡桐大树上危害,4月下旬又飞到大田泡桐幼苗上危害;5月至6月上旬为第1代成虫和若虫危害高峰期;7月中旬出现第2代若虫高峰;8月中、下旬出现第3代成虫高峰。9月份以后,成虫逐渐转移到苗圃、林地边缘的小树叶片上。品种中兰考桐、秋叶桐危害重,白花桐、川泡桐次之,台湾泡桐、米氏泡桐较抗虫害。娇驼跷蝽的天敌有草蛉、蚂蚁等。
虫害防治方法 (1)保护和利用天敌。 (2)因地制宜的选择较虫品种栽培,加强栽培管理,增强树势,提高抵抗力。结合冬耕,清除地面落叶、杂草,消灭越冬成虫。 (3)化学防治 在5月中旬即第1代若虫发生盛期之前,喷洒20%杀灭菊酯1500倍液或2.5%溴氰菊酯3000-5000倍液,或40%氧化乐果乳油或90%敌百虫晶体1000倍液。
虫害危害

以若虫群集嫩梢、嫩叶吸食汁液为害,受害嫩枝流出褐色粘液,逐渐萎缩,停止生长。嫩叶受害后,出现褐色小点,导致叶片萎缩不能正常展开,或展开后在斑点处破裂。
  虫害形态特征

成虫
体长3.5-4.2毫米,体狭长,黄褐色或灰褐色,形似大蚊。头顶圆鼓,向前伸。头部至胸部腹面呈黑色纵纹。触角褐色细长,第1节端部膨大,第4节纺锤形;末端为白色,各节具黑色环纹。黄色喙,伸达后胸足基节之间。前胸背板发达,向上隆起,具粗糙点刻,后缘中央及侧角上有3个显著的圆锥形突起。小盾片弯曲呈直立长刺。后胸两侧各具一个向后弯曲的长刺。足细长,其上具黑色环纹,各足腿节顶端膨大呈棒状。前翅黄白色,膜质透明,有紫色闪光。腹部纺锤形,黄绿色,背面具黑色斑块。 

卵
长0.6毫米,宽0.2毫米,长椭圆形,顶端有两个突起,表面有纵行刻纹,乳白色至黄白色。 

若虫
共5龄。老龄幼虫体黄绿色,细长,腹部中间膨大,端部尖细,稍向背上翘起,末端黑色。触角和足细长,各节上均具黑色轮纹。翅芽泡状,末端灰黑色。

虫害发生规律

娇驼跷蝽有世代重叠现象,1年发生3代。以第3代成虫在苗圃、林地附近地埂、杂草和落叶下越冬。翌年4月上旬开始活动,泡桐发芽后取食幼芽嫩叶危害。成虫在夜间羽化,5-7天即行交配。成虫不活泼,较稳定,严重受惊逃飞苗下,多在均在苗木上部的大片叶子背面取食活动,中部次之。4月开始产量卵,卵单粒,将卵散产于植株上部叶子背面主侧脉间的毛茸中,或背面边缘处。刚孵化的若虫在叶柄附近栖息。2龄若虫较活泼,多集中在苗木幼嫩梢的顶端或嫩叶上取食,3龄后稍有分散,可在叶子、叶柄上等处活动。4月上旬越冬代成虫飞到泡桐大树上危害,4月下旬又飞到大田泡桐幼苗上危害;5月至6月上旬为第1代成虫和若虫危害高峰期;7月中旬出现第2代若虫高峰;8月中、下旬出现第3代成虫高峰。9月份以后,成虫逐渐转移到苗圃、林地边缘的小树叶片上。品种中兰考桐、秋叶桐危害重,白花桐、川泡桐次之,台湾泡桐、米氏泡桐较抗虫害。娇驼跷蝽的天敌有草蛉、蚂蚁等。 
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较虫品种栽培,加强栽培管理,增强树势,提高抵抗力。结合冬耕,清除地面落叶、杂草,消灭越冬成虫。 

(3)化学防治 在5月中旬即第1代若虫发生盛期之前,喷洒20%杀灭菊酯1500倍液或2.5%溴氰菊酯3000-5000倍液,或40%氧化乐果乳油或90%敌百虫晶体1000倍液。
虫害危害

以若虫群集嫩梢、嫩叶吸食汁液为害,受害嫩枝流出褐色粘液,逐渐萎缩,停止生长。嫩叶受害后,出现褐色小点,导致叶片萎缩不能正常展开,或展开后在斑点处破裂。
  虫害形态特征

成虫
体长3.5-4.2毫米,体狭长,黄褐色或灰褐色,形似大蚊。头顶圆鼓,向前伸。头部至胸部腹面呈黑色纵纹。触角褐色细长,第1节端部膨大,第4节纺锤形;末端为白色,各节具黑色环纹。黄色喙,伸达后胸足基节之间。前胸背板发达,向上隆起,具粗糙点刻,后缘中央及侧角上有3个显著的圆锥形突起。小盾片弯曲呈直立长刺。后胸两侧各具一个向后弯曲的长刺。足细长,其上具黑色环纹,各足腿节顶端膨大呈棒状。前翅黄白色,膜质透明,有紫色闪光。腹部纺锤形,黄绿色,背面具黑色斑块。 

卵
长0.6毫米,宽0.2毫米,长椭圆形,顶端有两个突起,表面有纵行刻纹,乳白色至黄白色。 

若虫
共5龄。老龄幼虫体黄绿色,细长,腹部中间膨大,端部尖细,稍向背上翘起,末端黑色。触角和足细长,各节上均具黑色轮纹。翅芽泡状,末端灰黑色。

虫害发生规律

娇驼跷蝽有世代重叠现象,1年发生3代。以第3代成虫在苗圃、林地附近地埂、杂草和落叶下越冬。翌年4月上旬开始活动,泡桐发芽后取食幼芽嫩叶危害。成虫在夜间羽化,5-7天即行交配。成虫不活泼,较稳定,严重受惊逃飞苗下,多在均在苗木上部的大片叶子背面取食活动,中部次之。4月开始产量卵,卵单粒,将卵散产于植株上部叶子背面主侧脉间的毛茸中,或背面边缘处。刚孵化的若虫在叶柄附近栖息。2龄若虫较活泼,多集中在苗木幼嫩梢的顶端或嫩叶上取食,3龄后稍有分散,可在叶子、叶柄上等处活动。4月上旬越冬代成虫飞到泡桐大树上危害,4月下旬又飞到大田泡桐幼苗上危害;5月至6月上旬为第1代成虫和若虫危害高峰期;7月中旬出现第2代若虫高峰;8月中、下旬出现第3代成虫高峰。9月份以后,成虫逐渐转移到苗圃、林地边缘的小树叶片上。品种中兰考桐、秋叶桐危害重,白花桐、川泡桐次之,台湾泡桐、米氏泡桐较抗虫害。娇驼跷蝽的天敌有草蛉、蚂蚁等。 
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较虫品种栽培,加强栽培管理,增强树势,提高抵抗力。结合冬耕,清除地面落叶、杂草,消灭越冬成虫。 

(3)化学防治 在5月中旬即第1代若虫发生盛期之前,喷洒20%杀灭菊酯1500倍液或2.5%溴氰菊酯3000-5000倍液,或40%氧化乐果乳油或90%敌百虫晶体1000倍液。
虫害危害

以若虫群集嫩梢、嫩叶吸食汁液为害,受害嫩枝流出褐色粘液,逐渐萎缩,停止生长。嫩叶受害后,出现褐色小点,导致叶片萎缩不能正常展开,或展开后在斑点处破裂。
  虫害形态特征

成虫
体长3.5-4.2毫米,体狭长,黄褐色或灰褐色,形似大蚊。头顶圆鼓,向前伸。头部至胸部腹面呈黑色纵纹。触角褐色细长,第1节端部膨大,第4节纺锤形;末端为白色,各节具黑色环纹。黄色喙,伸达后胸足基节之间。前胸背板发达,向上隆起,具粗糙点刻,后缘中央及侧角上有3个显著的圆锥形突起。小盾片弯曲呈直立长刺。后胸两侧各具一个向后弯曲的长刺。足细长,其上具黑色环纹,各足腿节顶端膨大呈棒状。前翅黄白色,膜质透明,有紫色闪光。腹部纺锤形,黄绿色,背面具黑色斑块。 

卵
长0.6毫米,宽0.2毫米,长椭圆形,顶端有两个突起,表面有纵行刻纹,乳白色至黄白色。 

若虫
共5龄。老龄幼虫体黄绿色,细长,腹部中间膨大,端部尖细,稍向背上翘起,末端黑色。触角和足细长,各节上均具黑色轮纹。翅芽泡状,末端灰黑色。

虫害发生规律

娇驼跷蝽有世代重叠现象,1年发生3代。以第3代成虫在苗圃、林地附近地埂、杂草和落叶下越冬。翌年4月上旬开始活动,泡桐发芽后取食幼芽嫩叶危害。成虫在夜间羽化,5-7天即行交配。成虫不活泼,较稳定,严重受惊逃飞苗下,多在均在苗木上部的大片叶子背面取食活动,中部次之。4月开始产量卵,卵单粒,将卵散产于植株上部叶子背面主侧脉间的毛茸中,或背面边缘处。刚孵化的若虫在叶柄附近栖息。2龄若虫较活泼,多集中在苗木幼嫩梢的顶端或嫩叶上取食,3龄后稍有分散,可在叶子、叶柄上等处活动。4月上旬越冬代成虫飞到泡桐大树上危害,4月下旬又飞到大田泡桐幼苗上危害;5月至6月上旬为第1代成虫和若虫危害高峰期;7月中旬出现第2代若虫高峰;8月中、下旬出现第3代成虫高峰。9月份以后,成虫逐渐转移到苗圃、林地边缘的小树叶片上。品种中兰考桐、秋叶桐危害重,白花桐、川泡桐次之,台湾泡桐、米氏泡桐较抗虫害。娇驼跷蝽的天敌有草蛉、蚂蚁等。 
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较虫品种栽培,加强栽培管理,增强树势,提高抵抗力。结合冬耕,清除地面落叶、杂草,消灭越冬成虫。 

(3)化学防治 在5月中旬即第1代若虫发生盛期之前,喷洒20%杀灭菊酯1500倍液或2.5%溴氰菊酯3000-5000倍液,或40%氧化乐果乳油或90%敌百虫晶体1000倍液。
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Article
Miss Chen
2 hours ago
Miss Chen
虫害危害 为害特点 茸毒蛾幼虫食叶,受害叶片成缺刻或孔洞状,5龄幼虫食量大,常将叶片食光,老熟幼虫将叶卷起结茧。
虫害形态特征 成虫 雄虫翅展35-45毫米,雌虫翅展45-60毫米。头、胸部灰褐色。触角干灰白色,栉齿黄棕色;下唇须白灰色,外侧黑褐色;复眼四周黑色;足白黄色,胫节、跗节上有黑斑。腹部灰白色。雄蛾体褐色,前翅灰白色,分布黑色和褐色鳞片,亚基线黑色略带波浪形,内横线具黑色宽带,横脉纹灰褐色有黑边,外横线黑色双线大波浪形,缘线具一列黑褐色点,缘毛灰白色,有黑褐色斑;后翅白色带黑褐色鳞片,缘毛灰白色。雌蛾色浅,内线和外线清晰,末端线和端线模糊。 卵 扁圆形,黄青绿色至浅褐色,中央具1凹陷。 幼虫 老熟幼虫体长52毫米左右,体黄绿色或黄褐色,头部黄色,第1-5腹节间黑色,第5-8腹节间微黑色,亚背线在5-8腹节为间断的黑带,体腹面黑灰色,前胸两侧有向前伸的黄色毛束,第1-4腹节背面各有一褐黄色毛刷,四周生白毛,第8腹节背面有一紫红色毛束。足黄色,跗节上有长毛。腹足基部黑色,外侧有长毛,气门灰白色。 蛹 浅褐色,背生长毛束,腹面光滑,臀棘短圆锥形,末端具多个小钩。 茧 黄褐色,外附幼虫体毛。 虫害发生规律 东北年生l代,以幼虫越冬。长江下游地区年生3代,以蛹在树皮缝、杂草丛、屋檐下等处越冬。翌年4月中下旬成虫羽化,多在21时后羽化,交尾、产卵。成虫具趋光性,雄性较雌性趋光性强,昼伏夜出,白天静伏于叶子背面,树木伤疤、裂缝处,成虫寿命4-7天。越冬代成虫产卵于树皮上,其它代成虫产卵于叶片上,成块状排列。卵历期10天左右。5月上旬出现第一代幼虫,6月下旬出现第2代幼虫,8月中旬出现第3代幼虫, 9月上旬幼虫开始化蛹,进入越冬期。幼虫共5龄,1-2龄期群集生活,啃食叶肉。进入3龄期,分散取食。进入5龄期,食量大增,可将叶片食光。3龄以后的幼虫较活跃,善于爬行。受惊后体曲卷,收缩、假死落地片刻后,迅速爬行。幼虫期体色黑黄、浅黄等色多变。第1、2代幼虫化蛹多在树皮缝、枝杈、伤疤、丛枝中。茸毒蛾靠成虫迁飞传播,靠交通工具携带幼虫远距离传播。在种植中纯林受害重,混交林受害轻。
虫害防治方法 (1)保护和利用天敌。 (2)因地制宜的选择较抗虫品种。 (3)加强栽培管理,增强树势,提高植株抵抗力。营造混合林,及时清理杂草、枯枝,减少虫源。 (4)在茸毒蛾发生高峰期,叶面喷洒2.5%溴氰菊酯3000-5000倍液或90%敌百虫800-1000倍液。 (5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
虫害危害

为害特点 茸毒蛾幼虫食叶,受害叶片成缺刻或孔洞状,5龄幼虫食量大,常将叶片食光,老熟幼虫将叶卷起结茧。 
  虫害形态特征

成虫
雄虫翅展35-45毫米,雌虫翅展45-60毫米。头、胸部灰褐色。触角干灰白色,栉齿黄棕色;下唇须白灰色,外侧黑褐色;复眼四周黑色;足白黄色,胫节、跗节上有黑斑。腹部灰白色。雄蛾体褐色,前翅灰白色,分布黑色和褐色鳞片,亚基线黑色略带波浪形,内横线具黑色宽带,横脉纹灰褐色有黑边,外横线黑色双线大波浪形,缘线具一列黑褐色点,缘毛灰白色,有黑褐色斑;后翅白色带黑褐色鳞片,缘毛灰白色。雌蛾色浅,内线和外线清晰,末端线和端线模糊。 

卵
扁圆形,黄青绿色至浅褐色,中央具1凹陷。 

幼虫
老熟幼虫体长52毫米左右,体黄绿色或黄褐色,头部黄色,第1-5腹节间黑色,第5-8腹节间微黑色,亚背线在5-8腹节为间断的黑带,体腹面黑灰色,前胸两侧有向前伸的黄色毛束,第1-4腹节背面各有一褐黄色毛刷,四周生白毛,第8腹节背面有一紫红色毛束。足黄色,跗节上有长毛。腹足基部黑色,外侧有长毛,气门灰白色。 

蛹
浅褐色,背生长毛束,腹面光滑,臀棘短圆锥形,末端具多个小钩。 

茧
黄褐色,外附幼虫体毛。

虫害发生规律

东北年生l代,以幼虫越冬。长江下游地区年生3代,以蛹在树皮缝、杂草丛、屋檐下等处越冬。翌年4月中下旬成虫羽化,多在21时后羽化,交尾、产卵。成虫具趋光性,雄性较雌性趋光性强,昼伏夜出,白天静伏于叶子背面,树木伤疤、裂缝处,成虫寿命4-7天。越冬代成虫产卵于树皮上,其它代成虫产卵于叶片上,成块状排列。卵历期10天左右。5月上旬出现第一代幼虫,6月下旬出现第2代幼虫,8月中旬出现第3代幼虫, 9月上旬幼虫开始化蛹,进入越冬期。幼虫共5龄,1-2龄期群集生活,啃食叶肉。进入3龄期,分散取食。进入5龄期,食量大增,可将叶片食光。3龄以后的幼虫较活跃,善于爬行。受惊后体曲卷,收缩、假死落地片刻后,迅速爬行。幼虫期体色黑黄、浅黄等色多变。第1、2代幼虫化蛹多在树皮缝、枝杈、伤疤、丛枝中。茸毒蛾靠成虫迁飞传播,靠交通工具携带幼虫远距离传播。在种植中纯林受害重,混交林受害轻。 
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种。 

(3)加强栽培管理,增强树势,提高植株抵抗力。营造混合林,及时清理杂草、枯枝,减少虫源。 

(4)在茸毒蛾发生高峰期,叶面喷洒2.5%溴氰菊酯3000-5000倍液或90%敌百虫800-1000倍液。 

(5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
虫害危害

为害特点 茸毒蛾幼虫食叶,受害叶片成缺刻或孔洞状,5龄幼虫食量大,常将叶片食光,老熟幼虫将叶卷起结茧。 
  虫害形态特征

成虫
雄虫翅展35-45毫米,雌虫翅展45-60毫米。头、胸部灰褐色。触角干灰白色,栉齿黄棕色;下唇须白灰色,外侧黑褐色;复眼四周黑色;足白黄色,胫节、跗节上有黑斑。腹部灰白色。雄蛾体褐色,前翅灰白色,分布黑色和褐色鳞片,亚基线黑色略带波浪形,内横线具黑色宽带,横脉纹灰褐色有黑边,外横线黑色双线大波浪形,缘线具一列黑褐色点,缘毛灰白色,有黑褐色斑;后翅白色带黑褐色鳞片,缘毛灰白色。雌蛾色浅,内线和外线清晰,末端线和端线模糊。 

卵
扁圆形,黄青绿色至浅褐色,中央具1凹陷。 

幼虫
老熟幼虫体长52毫米左右,体黄绿色或黄褐色,头部黄色,第1-5腹节间黑色,第5-8腹节间微黑色,亚背线在5-8腹节为间断的黑带,体腹面黑灰色,前胸两侧有向前伸的黄色毛束,第1-4腹节背面各有一褐黄色毛刷,四周生白毛,第8腹节背面有一紫红色毛束。足黄色,跗节上有长毛。腹足基部黑色,外侧有长毛,气门灰白色。 

蛹
浅褐色,背生长毛束,腹面光滑,臀棘短圆锥形,末端具多个小钩。 

茧
黄褐色,外附幼虫体毛。

虫害发生规律

东北年生l代,以幼虫越冬。长江下游地区年生3代,以蛹在树皮缝、杂草丛、屋檐下等处越冬。翌年4月中下旬成虫羽化,多在21时后羽化,交尾、产卵。成虫具趋光性,雄性较雌性趋光性强,昼伏夜出,白天静伏于叶子背面,树木伤疤、裂缝处,成虫寿命4-7天。越冬代成虫产卵于树皮上,其它代成虫产卵于叶片上,成块状排列。卵历期10天左右。5月上旬出现第一代幼虫,6月下旬出现第2代幼虫,8月中旬出现第3代幼虫, 9月上旬幼虫开始化蛹,进入越冬期。幼虫共5龄,1-2龄期群集生活,啃食叶肉。进入3龄期,分散取食。进入5龄期,食量大增,可将叶片食光。3龄以后的幼虫较活跃,善于爬行。受惊后体曲卷,收缩、假死落地片刻后,迅速爬行。幼虫期体色黑黄、浅黄等色多变。第1、2代幼虫化蛹多在树皮缝、枝杈、伤疤、丛枝中。茸毒蛾靠成虫迁飞传播,靠交通工具携带幼虫远距离传播。在种植中纯林受害重,混交林受害轻。 
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种。 

(3)加强栽培管理,增强树势,提高植株抵抗力。营造混合林,及时清理杂草、枯枝,减少虫源。 

(4)在茸毒蛾发生高峰期,叶面喷洒2.5%溴氰菊酯3000-5000倍液或90%敌百虫800-1000倍液。 

(5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
虫害危害

为害特点 茸毒蛾幼虫食叶,受害叶片成缺刻或孔洞状,5龄幼虫食量大,常将叶片食光,老熟幼虫将叶卷起结茧。 
  虫害形态特征

成虫
雄虫翅展35-45毫米,雌虫翅展45-60毫米。头、胸部灰褐色。触角干灰白色,栉齿黄棕色;下唇须白灰色,外侧黑褐色;复眼四周黑色;足白黄色,胫节、跗节上有黑斑。腹部灰白色。雄蛾体褐色,前翅灰白色,分布黑色和褐色鳞片,亚基线黑色略带波浪形,内横线具黑色宽带,横脉纹灰褐色有黑边,外横线黑色双线大波浪形,缘线具一列黑褐色点,缘毛灰白色,有黑褐色斑;后翅白色带黑褐色鳞片,缘毛灰白色。雌蛾色浅,内线和外线清晰,末端线和端线模糊。 

卵
扁圆形,黄青绿色至浅褐色,中央具1凹陷。 

幼虫
老熟幼虫体长52毫米左右,体黄绿色或黄褐色,头部黄色,第1-5腹节间黑色,第5-8腹节间微黑色,亚背线在5-8腹节为间断的黑带,体腹面黑灰色,前胸两侧有向前伸的黄色毛束,第1-4腹节背面各有一褐黄色毛刷,四周生白毛,第8腹节背面有一紫红色毛束。足黄色,跗节上有长毛。腹足基部黑色,外侧有长毛,气门灰白色。 

蛹
浅褐色,背生长毛束,腹面光滑,臀棘短圆锥形,末端具多个小钩。 

茧
黄褐色,外附幼虫体毛。

虫害发生规律

东北年生l代,以幼虫越冬。长江下游地区年生3代,以蛹在树皮缝、杂草丛、屋檐下等处越冬。翌年4月中下旬成虫羽化,多在21时后羽化,交尾、产卵。成虫具趋光性,雄性较雌性趋光性强,昼伏夜出,白天静伏于叶子背面,树木伤疤、裂缝处,成虫寿命4-7天。越冬代成虫产卵于树皮上,其它代成虫产卵于叶片上,成块状排列。卵历期10天左右。5月上旬出现第一代幼虫,6月下旬出现第2代幼虫,8月中旬出现第3代幼虫, 9月上旬幼虫开始化蛹,进入越冬期。幼虫共5龄,1-2龄期群集生活,啃食叶肉。进入3龄期,分散取食。进入5龄期,食量大增,可将叶片食光。3龄以后的幼虫较活跃,善于爬行。受惊后体曲卷,收缩、假死落地片刻后,迅速爬行。幼虫期体色黑黄、浅黄等色多变。第1、2代幼虫化蛹多在树皮缝、枝杈、伤疤、丛枝中。茸毒蛾靠成虫迁飞传播,靠交通工具携带幼虫远距离传播。在种植中纯林受害重,混交林受害轻。 
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种。 

(3)加强栽培管理,增强树势,提高植株抵抗力。营造混合林,及时清理杂草、枯枝,减少虫源。 

(4)在茸毒蛾发生高峰期,叶面喷洒2.5%溴氰菊酯3000-5000倍液或90%敌百虫800-1000倍液。 

(5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
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Miss Chen
2 hours ago
Miss Chen
虫害危害 细毛蝽若虫群集嫩枝和幼叶刺吸其汁液,被害部呈褐色小点,嫩茎被害后流出褐色粘液。导致嫩叶干缩、畸形,嫩梢萎缩干枯,抑制泡桐的生长。
虫害形态特征 成虫 体长8-13毫米,宽4.5-7毫米,黄褐色或黑褐色,体色变化较大,全体长满细毛,密布粗大黑点;头黑褐色,触角黑色,5节,各节基部为黄白色, 深浅相间如斑纹。小盾片长,呈三角形,淡黄色,末端钝而光滑。体侧各节结合处黄、黑相间。翅端长于腹末,前翅革质部淡红褐色到暗红暗色,膜质部分淡褐色,透明。足褐色,胫节未端及跗节第1、3节黑色,跗节第2节黄色。 卵 圆筒形,桔黄色,上有圆盖,聚集成块,排列整齐。 若虫 共5龄,体长9毫米左右,黑褐色,密布绒毛和刻点。触角4节黑色。腹背第4—6节有臭腺孔3对,呈黄色小点状,其周围黑色。 虫害发生规律 该虫每年发生2-3代,有世代重叠现象,以成虫在杂草、枯枝落叶下、植物根际、树皮缝、土缝、石缝及屋檐下越冬。翌年4月条件合适时开始取食活动,4月下旬产卵,将卵产于植物的叶片、嫩枝、花蕾和苞片上,卵竖立成块,每块14-28粒。卵经过4-5天孵化,若虫孵化后,聚集在卵块上不动,停2-3天后活动,群集在泡桐幼苗嫩梢上吸食茎和叶上的汁液,被害叶初呈褐色小点,日久皱缩,嫩茎被害后流出褐色粘液。6月初第1代成虫羽化,6月中旬为产卵盛期。7月初第二代成虫羽化;第三代成虫在8月中旬羽化。10月上、中旬成虫进入越冬期。成虫飞翔能力较强,成虫寿命长,产卵期长,成虫还有吸食蚜虫、蝇类、棉铃虫的幼虫汁液的习性。
虫害防治方法 (1)保护和利用天敌。蝽卵蜂对细毛蝽的卵寄生率很高。 (2)因地制宜的选择较抗虫品种。加强栽培管理,增强树势,提高植株抵抗力。春秋季节,清除杂草、刮树皮、枯枝落叶并集中烧毁,消灭越冬成虫。 (3)若虫盛发期,可喷洒90%敌百虫或20%杀灭菊酯1500-2000倍液或2.5%溴氰菊酯3000-5000倍液。
虫害危害

细毛蝽若虫群集嫩枝和幼叶刺吸其汁液,被害部呈褐色小点,嫩茎被害后流出褐色粘液。导致嫩叶干缩、畸形,嫩梢萎缩干枯,抑制泡桐的生长。 
  虫害形态特征

成虫
体长8-13毫米,宽4.5-7毫米,黄褐色或黑褐色,体色变化较大,全体长满细毛,密布粗大黑点;头黑褐色,触角黑色,5节,各节基部为黄白色, 深浅相间如斑纹。小盾片长,呈三角形,淡黄色,末端钝而光滑。体侧各节结合处黄、黑相间。翅端长于腹末,前翅革质部淡红褐色到暗红暗色,膜质部分淡褐色,透明。足褐色,胫节未端及跗节第1、3节黑色,跗节第2节黄色。 

卵
圆筒形,桔黄色,上有圆盖,聚集成块,排列整齐。 

若虫
共5龄,体长9毫米左右,黑褐色,密布绒毛和刻点。触角4节黑色。腹背第4—6节有臭腺孔3对,呈黄色小点状,其周围黑色。

虫害发生规律

该虫每年发生2-3代,有世代重叠现象,以成虫在杂草、枯枝落叶下、植物根际、树皮缝、土缝、石缝及屋檐下越冬。翌年4月条件合适时开始取食活动,4月下旬产卵,将卵产于植物的叶片、嫩枝、花蕾和苞片上,卵竖立成块,每块14-28粒。卵经过4-5天孵化,若虫孵化后,聚集在卵块上不动,停2-3天后活动,群集在泡桐幼苗嫩梢上吸食茎和叶上的汁液,被害叶初呈褐色小点,日久皱缩,嫩茎被害后流出褐色粘液。6月初第1代成虫羽化,6月中旬为产卵盛期。7月初第二代成虫羽化;第三代成虫在8月中旬羽化。10月上、中旬成虫进入越冬期。成虫飞翔能力较强,成虫寿命长,产卵期长,成虫还有吸食蚜虫、蝇类、棉铃虫的幼虫汁液的习性。 
  虫害防治方法

(1)保护和利用天敌。蝽卵蜂对细毛蝽的卵寄生率很高。

(2)因地制宜的选择较抗虫品种。加强栽培管理,增强树势,提高植株抵抗力。春秋季节,清除杂草、刮树皮、枯枝落叶并集中烧毁,消灭越冬成虫。 

(3)若虫盛发期,可喷洒90%敌百虫或20%杀灭菊酯1500-2000倍液或2.5%溴氰菊酯3000-5000倍液。
虫害危害

细毛蝽若虫群集嫩枝和幼叶刺吸其汁液,被害部呈褐色小点,嫩茎被害后流出褐色粘液。导致嫩叶干缩、畸形,嫩梢萎缩干枯,抑制泡桐的生长。 
  虫害形态特征

成虫
体长8-13毫米,宽4.5-7毫米,黄褐色或黑褐色,体色变化较大,全体长满细毛,密布粗大黑点;头黑褐色,触角黑色,5节,各节基部为黄白色, 深浅相间如斑纹。小盾片长,呈三角形,淡黄色,末端钝而光滑。体侧各节结合处黄、黑相间。翅端长于腹末,前翅革质部淡红褐色到暗红暗色,膜质部分淡褐色,透明。足褐色,胫节未端及跗节第1、3节黑色,跗节第2节黄色。 

卵
圆筒形,桔黄色,上有圆盖,聚集成块,排列整齐。 

若虫
共5龄,体长9毫米左右,黑褐色,密布绒毛和刻点。触角4节黑色。腹背第4—6节有臭腺孔3对,呈黄色小点状,其周围黑色。

虫害发生规律

该虫每年发生2-3代,有世代重叠现象,以成虫在杂草、枯枝落叶下、植物根际、树皮缝、土缝、石缝及屋檐下越冬。翌年4月条件合适时开始取食活动,4月下旬产卵,将卵产于植物的叶片、嫩枝、花蕾和苞片上,卵竖立成块,每块14-28粒。卵经过4-5天孵化,若虫孵化后,聚集在卵块上不动,停2-3天后活动,群集在泡桐幼苗嫩梢上吸食茎和叶上的汁液,被害叶初呈褐色小点,日久皱缩,嫩茎被害后流出褐色粘液。6月初第1代成虫羽化,6月中旬为产卵盛期。7月初第二代成虫羽化;第三代成虫在8月中旬羽化。10月上、中旬成虫进入越冬期。成虫飞翔能力较强,成虫寿命长,产卵期长,成虫还有吸食蚜虫、蝇类、棉铃虫的幼虫汁液的习性。 
  虫害防治方法

(1)保护和利用天敌。蝽卵蜂对细毛蝽的卵寄生率很高。

(2)因地制宜的选择较抗虫品种。加强栽培管理,增强树势,提高植株抵抗力。春秋季节,清除杂草、刮树皮、枯枝落叶并集中烧毁,消灭越冬成虫。 

(3)若虫盛发期,可喷洒90%敌百虫或20%杀灭菊酯1500-2000倍液或2.5%溴氰菊酯3000-5000倍液。
虫害危害

细毛蝽若虫群集嫩枝和幼叶刺吸其汁液,被害部呈褐色小点,嫩茎被害后流出褐色粘液。导致嫩叶干缩、畸形,嫩梢萎缩干枯,抑制泡桐的生长。 
  虫害形态特征

成虫
体长8-13毫米,宽4.5-7毫米,黄褐色或黑褐色,体色变化较大,全体长满细毛,密布粗大黑点;头黑褐色,触角黑色,5节,各节基部为黄白色, 深浅相间如斑纹。小盾片长,呈三角形,淡黄色,末端钝而光滑。体侧各节结合处黄、黑相间。翅端长于腹末,前翅革质部淡红褐色到暗红暗色,膜质部分淡褐色,透明。足褐色,胫节未端及跗节第1、3节黑色,跗节第2节黄色。 

卵
圆筒形,桔黄色,上有圆盖,聚集成块,排列整齐。 

若虫
共5龄,体长9毫米左右,黑褐色,密布绒毛和刻点。触角4节黑色。腹背第4—6节有臭腺孔3对,呈黄色小点状,其周围黑色。

虫害发生规律

该虫每年发生2-3代,有世代重叠现象,以成虫在杂草、枯枝落叶下、植物根际、树皮缝、土缝、石缝及屋檐下越冬。翌年4月条件合适时开始取食活动,4月下旬产卵,将卵产于植物的叶片、嫩枝、花蕾和苞片上,卵竖立成块,每块14-28粒。卵经过4-5天孵化,若虫孵化后,聚集在卵块上不动,停2-3天后活动,群集在泡桐幼苗嫩梢上吸食茎和叶上的汁液,被害叶初呈褐色小点,日久皱缩,嫩茎被害后流出褐色粘液。6月初第1代成虫羽化,6月中旬为产卵盛期。7月初第二代成虫羽化;第三代成虫在8月中旬羽化。10月上、中旬成虫进入越冬期。成虫飞翔能力较强,成虫寿命长,产卵期长,成虫还有吸食蚜虫、蝇类、棉铃虫的幼虫汁液的习性。 
  虫害防治方法

(1)保护和利用天敌。蝽卵蜂对细毛蝽的卵寄生率很高。

(2)因地制宜的选择较抗虫品种。加强栽培管理,增强树势,提高植株抵抗力。春秋季节,清除杂草、刮树皮、枯枝落叶并集中烧毁,消灭越冬成虫。 

(3)若虫盛发期,可喷洒90%敌百虫或20%杀灭菊酯1500-2000倍液或2.5%溴氰菊酯3000-5000倍液。
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Miss Chen
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Miss Chen
虫害分布 在我国浙江、江苏、河南等省发生严重。
虫害形态特征 成虫 体长18-22毫米,翅展45-72毫米。复眼深褐色,雌蛾触角丝状,雄蛾触角羽状。翅白色,散布灰色或棕褐色斑纹,外横线呈一串断续的棕褐色或灰色圆斑。前翅基部有一深褐色大圆斑。雌蛾体末有黄色绒毛。足灰白色,胫节和 跗节具有浅灰色的斑纹。 卵 长0.9毫米,扁圆形,绿色。卵块上覆有一层黄棕色绒毛,孵化前变为黑色。 幼虫 体长70-78 毫米,通常幼虫的体色与寄主的颜色相近似,体绿色、茶褐色、灰色不一,并散生有灰白色斑点。头顶具黑纹,呈倒“V”形凹陷,头顶及前胸背板两侧有褐色突起,全表多灰色斑点。 蛹 长24-32 毫米,棕褐或棕黑色,有刻点,臀棘分叉。雌蛹较大。翠绿色至黑褐色,体表光滑,布满小刻点。
虫害发生规律 木橑尺蠖河南省l年发生l代,在浙江省余杭县一年发生2-3代,以蛹在根际松土中越冬。 越冬蛹在5月上旬羽化,7月中、下旬为羽化盛期,成虫于6月下旬产卵,7月中、下旬为盛期。幼虫于7月上旬孵化,孵化适宜温度为26.7℃,相对湿度为50-70%。盛期为7月下旬至8月上旬。在浙江第一、二代 幼虫分别于5月下旬至6月上旬、7月下旬至8月初盛发。老熟幼虫于8月中旬化蛹,9月为盛期。卵历期9-10天。幼虫很活泼,孵化后即迅速分散,爬行快;稍受惊动,即吐丝下垂,可借风力转移危害。初孵幼虫一般在叶尖取食叶肉,留下叶脉,将叶食成网状。2龄幼虫则逐渐开始在叶缘危害,静止时,多在叶尖端或叶缘用臀足攀住叶的边缘,身体向外直立伸出,如小枯枝,不易发现。3龄以后的幼虫行动迟缓。幼虫共6龄,幼虫期约40天。每次脱皮前1-2天即停止取食,脱皮后有食皮现象。老熟幼虫即坠地化蛹。通常选择梯田壁内、石堰缝里、乱石堆中以及树干周围和荒坡杂草等松软、阴暗潮湿的地方化蛹,入土深度一般在3cm左右。在冬季少雪,春季干旱的年份,蛹自然死亡率高;5月份降雨较多,发生率较高。成虫羽化的适宜温度为24.5-25℃。成虫趋光性强,白天静伏在树干、树叶等处,易发现,尤其在早晨,翅受潮后不易飞翔,容易捕捉。在晚间活动,羽化后即行交尾,交尾后1-2天内产卵。卵多产于寄主植物的皮缝里或石块上,块产,排列不规则,并覆盖一层厚厚的棕黄色绒毛。成虫寿命4-12天。
虫害防治方法 (1)保护和利用天敌。 (2)因地制宜的选择较抗虫品种栽培。 (3)晚秋或春季根据虫害发生情况,在蛹较集中的园内,刨树盘挖捡虫蛹,减少虫害。 (4)利用成虫趋光性,设置黑光灯诱杀,或在早上人工捕捉。 (5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
虫害分布

在我国浙江、江苏、河南等省发生严重。
  虫害形态特征

成虫
体长18-22毫米,翅展45-72毫米。复眼深褐色,雌蛾触角丝状,雄蛾触角羽状。翅白色,散布灰色或棕褐色斑纹,外横线呈一串断续的棕褐色或灰色圆斑。前翅基部有一深褐色大圆斑。雌蛾体末有黄色绒毛。足灰白色,胫节和 跗节具有浅灰色的斑纹。 

卵
长0.9毫米,扁圆形,绿色。卵块上覆有一层黄棕色绒毛,孵化前变为黑色。 

幼虫
体长70-78 毫米,通常幼虫的体色与寄主的颜色相近似,体绿色、茶褐色、灰色不一,并散生有灰白色斑点。头顶具黑纹,呈倒“V”形凹陷,头顶及前胸背板两侧有褐色突起,全表多灰色斑点。 

蛹
长24-32 毫米,棕褐或棕黑色,有刻点,臀棘分叉。雌蛹较大。翠绿色至黑褐色,体表光滑,布满小刻点。 
  虫害发生规律

木橑尺蠖河南省l年发生l代,在浙江省余杭县一年发生2-3代,以蛹在根际松土中越冬。 越冬蛹在5月上旬羽化,7月中、下旬为羽化盛期,成虫于6月下旬产卵,7月中、下旬为盛期。幼虫于7月上旬孵化,孵化适宜温度为26.7℃,相对湿度为50-70%。盛期为7月下旬至8月上旬。在浙江第一、二代 幼虫分别于5月下旬至6月上旬、7月下旬至8月初盛发。老熟幼虫于8月中旬化蛹,9月为盛期。卵历期9-10天。幼虫很活泼,孵化后即迅速分散,爬行快;稍受惊动,即吐丝下垂,可借风力转移危害。初孵幼虫一般在叶尖取食叶肉,留下叶脉,将叶食成网状。2龄幼虫则逐渐开始在叶缘危害,静止时,多在叶尖端或叶缘用臀足攀住叶的边缘,身体向外直立伸出,如小枯枝,不易发现。3龄以后的幼虫行动迟缓。幼虫共6龄,幼虫期约40天。每次脱皮前1-2天即停止取食,脱皮后有食皮现象。老熟幼虫即坠地化蛹。通常选择梯田壁内、石堰缝里、乱石堆中以及树干周围和荒坡杂草等松软、阴暗潮湿的地方化蛹,入土深度一般在3cm左右。在冬季少雪,春季干旱的年份,蛹自然死亡率高;5月份降雨较多,发生率较高。成虫羽化的适宜温度为24.5-25℃。成虫趋光性强,白天静伏在树干、树叶等处,易发现,尤其在早晨,翅受潮后不易飞翔,容易捕捉。在晚间活动,羽化后即行交尾,交尾后1-2天内产卵。卵多产于寄主植物的皮缝里或石块上,块产,排列不规则,并覆盖一层厚厚的棕黄色绒毛。成虫寿命4-12天。
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种栽培。 

(3)晚秋或春季根据虫害发生情况,在蛹较集中的园内,刨树盘挖捡虫蛹,减少虫害。 

(4)利用成虫趋光性,设置黑光灯诱杀,或在早上人工捕捉。 

(5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
虫害分布

在我国浙江、江苏、河南等省发生严重。
  虫害形态特征

成虫
体长18-22毫米,翅展45-72毫米。复眼深褐色,雌蛾触角丝状,雄蛾触角羽状。翅白色,散布灰色或棕褐色斑纹,外横线呈一串断续的棕褐色或灰色圆斑。前翅基部有一深褐色大圆斑。雌蛾体末有黄色绒毛。足灰白色,胫节和 跗节具有浅灰色的斑纹。 

卵
长0.9毫米,扁圆形,绿色。卵块上覆有一层黄棕色绒毛,孵化前变为黑色。 

幼虫
体长70-78 毫米,通常幼虫的体色与寄主的颜色相近似,体绿色、茶褐色、灰色不一,并散生有灰白色斑点。头顶具黑纹,呈倒“V”形凹陷,头顶及前胸背板两侧有褐色突起,全表多灰色斑点。 

蛹
长24-32 毫米,棕褐或棕黑色,有刻点,臀棘分叉。雌蛹较大。翠绿色至黑褐色,体表光滑,布满小刻点。 
  虫害发生规律

木橑尺蠖河南省l年发生l代,在浙江省余杭县一年发生2-3代,以蛹在根际松土中越冬。 越冬蛹在5月上旬羽化,7月中、下旬为羽化盛期,成虫于6月下旬产卵,7月中、下旬为盛期。幼虫于7月上旬孵化,孵化适宜温度为26.7℃,相对湿度为50-70%。盛期为7月下旬至8月上旬。在浙江第一、二代 幼虫分别于5月下旬至6月上旬、7月下旬至8月初盛发。老熟幼虫于8月中旬化蛹,9月为盛期。卵历期9-10天。幼虫很活泼,孵化后即迅速分散,爬行快;稍受惊动,即吐丝下垂,可借风力转移危害。初孵幼虫一般在叶尖取食叶肉,留下叶脉,将叶食成网状。2龄幼虫则逐渐开始在叶缘危害,静止时,多在叶尖端或叶缘用臀足攀住叶的边缘,身体向外直立伸出,如小枯枝,不易发现。3龄以后的幼虫行动迟缓。幼虫共6龄,幼虫期约40天。每次脱皮前1-2天即停止取食,脱皮后有食皮现象。老熟幼虫即坠地化蛹。通常选择梯田壁内、石堰缝里、乱石堆中以及树干周围和荒坡杂草等松软、阴暗潮湿的地方化蛹,入土深度一般在3cm左右。在冬季少雪,春季干旱的年份,蛹自然死亡率高;5月份降雨较多,发生率较高。成虫羽化的适宜温度为24.5-25℃。成虫趋光性强,白天静伏在树干、树叶等处,易发现,尤其在早晨,翅受潮后不易飞翔,容易捕捉。在晚间活动,羽化后即行交尾,交尾后1-2天内产卵。卵多产于寄主植物的皮缝里或石块上,块产,排列不规则,并覆盖一层厚厚的棕黄色绒毛。成虫寿命4-12天。
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种栽培。 

(3)晚秋或春季根据虫害发生情况,在蛹较集中的园内,刨树盘挖捡虫蛹,减少虫害。 

(4)利用成虫趋光性,设置黑光灯诱杀,或在早上人工捕捉。 

(5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
虫害分布

在我国浙江、江苏、河南等省发生严重。
  虫害形态特征

成虫
体长18-22毫米,翅展45-72毫米。复眼深褐色,雌蛾触角丝状,雄蛾触角羽状。翅白色,散布灰色或棕褐色斑纹,外横线呈一串断续的棕褐色或灰色圆斑。前翅基部有一深褐色大圆斑。雌蛾体末有黄色绒毛。足灰白色,胫节和 跗节具有浅灰色的斑纹。 

卵
长0.9毫米,扁圆形,绿色。卵块上覆有一层黄棕色绒毛,孵化前变为黑色。 

幼虫
体长70-78 毫米,通常幼虫的体色与寄主的颜色相近似,体绿色、茶褐色、灰色不一,并散生有灰白色斑点。头顶具黑纹,呈倒“V”形凹陷,头顶及前胸背板两侧有褐色突起,全表多灰色斑点。 

蛹
长24-32 毫米,棕褐或棕黑色,有刻点,臀棘分叉。雌蛹较大。翠绿色至黑褐色,体表光滑,布满小刻点。 
  虫害发生规律

木橑尺蠖河南省l年发生l代,在浙江省余杭县一年发生2-3代,以蛹在根际松土中越冬。 越冬蛹在5月上旬羽化,7月中、下旬为羽化盛期,成虫于6月下旬产卵,7月中、下旬为盛期。幼虫于7月上旬孵化,孵化适宜温度为26.7℃,相对湿度为50-70%。盛期为7月下旬至8月上旬。在浙江第一、二代 幼虫分别于5月下旬至6月上旬、7月下旬至8月初盛发。老熟幼虫于8月中旬化蛹,9月为盛期。卵历期9-10天。幼虫很活泼,孵化后即迅速分散,爬行快;稍受惊动,即吐丝下垂,可借风力转移危害。初孵幼虫一般在叶尖取食叶肉,留下叶脉,将叶食成网状。2龄幼虫则逐渐开始在叶缘危害,静止时,多在叶尖端或叶缘用臀足攀住叶的边缘,身体向外直立伸出,如小枯枝,不易发现。3龄以后的幼虫行动迟缓。幼虫共6龄,幼虫期约40天。每次脱皮前1-2天即停止取食,脱皮后有食皮现象。老熟幼虫即坠地化蛹。通常选择梯田壁内、石堰缝里、乱石堆中以及树干周围和荒坡杂草等松软、阴暗潮湿的地方化蛹,入土深度一般在3cm左右。在冬季少雪,春季干旱的年份,蛹自然死亡率高;5月份降雨较多,发生率较高。成虫羽化的适宜温度为24.5-25℃。成虫趋光性强,白天静伏在树干、树叶等处,易发现,尤其在早晨,翅受潮后不易飞翔,容易捕捉。在晚间活动,羽化后即行交尾,交尾后1-2天内产卵。卵多产于寄主植物的皮缝里或石块上,块产,排列不规则,并覆盖一层厚厚的棕黄色绒毛。成虫寿命4-12天。
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种栽培。 

(3)晚秋或春季根据虫害发生情况,在蛹较集中的园内,刨树盘挖捡虫蛹,减少虫害。 

(4)利用成虫趋光性,设置黑光灯诱杀,或在早上人工捕捉。 

(5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
虫害分布

在我国浙江、江苏、河南等省发生严重。
  虫害形态特征

成虫
体长18-22毫米,翅展45-72毫米。复眼深褐色,雌蛾触角丝状,雄蛾触角羽状。翅白色,散布灰色或棕褐色斑纹,外横线呈一串断续的棕褐色或灰色圆斑。前翅基部有一深褐色大圆斑。雌蛾体末有黄色绒毛。足灰白色,胫节和 跗节具有浅灰色的斑纹。 

卵
长0.9毫米,扁圆形,绿色。卵块上覆有一层黄棕色绒毛,孵化前变为黑色。 

幼虫
体长70-78 毫米,通常幼虫的体色与寄主的颜色相近似,体绿色、茶褐色、灰色不一,并散生有灰白色斑点。头顶具黑纹,呈倒“V”形凹陷,头顶及前胸背板两侧有褐色突起,全表多灰色斑点。 

蛹
长24-32 毫米,棕褐或棕黑色,有刻点,臀棘分叉。雌蛹较大。翠绿色至黑褐色,体表光滑,布满小刻点。 
  虫害发生规律

木橑尺蠖河南省l年发生l代,在浙江省余杭县一年发生2-3代,以蛹在根际松土中越冬。 越冬蛹在5月上旬羽化,7月中、下旬为羽化盛期,成虫于6月下旬产卵,7月中、下旬为盛期。幼虫于7月上旬孵化,孵化适宜温度为26.7℃,相对湿度为50-70%。盛期为7月下旬至8月上旬。在浙江第一、二代 幼虫分别于5月下旬至6月上旬、7月下旬至8月初盛发。老熟幼虫于8月中旬化蛹,9月为盛期。卵历期9-10天。幼虫很活泼,孵化后即迅速分散,爬行快;稍受惊动,即吐丝下垂,可借风力转移危害。初孵幼虫一般在叶尖取食叶肉,留下叶脉,将叶食成网状。2龄幼虫则逐渐开始在叶缘危害,静止时,多在叶尖端或叶缘用臀足攀住叶的边缘,身体向外直立伸出,如小枯枝,不易发现。3龄以后的幼虫行动迟缓。幼虫共6龄,幼虫期约40天。每次脱皮前1-2天即停止取食,脱皮后有食皮现象。老熟幼虫即坠地化蛹。通常选择梯田壁内、石堰缝里、乱石堆中以及树干周围和荒坡杂草等松软、阴暗潮湿的地方化蛹,入土深度一般在3cm左右。在冬季少雪,春季干旱的年份,蛹自然死亡率高;5月份降雨较多,发生率较高。成虫羽化的适宜温度为24.5-25℃。成虫趋光性强,白天静伏在树干、树叶等处,易发现,尤其在早晨,翅受潮后不易飞翔,容易捕捉。在晚间活动,羽化后即行交尾,交尾后1-2天内产卵。卵多产于寄主植物的皮缝里或石块上,块产,排列不规则,并覆盖一层厚厚的棕黄色绒毛。成虫寿命4-12天。
  虫害防治方法

(1)保护和利用天敌。 

(2)因地制宜的选择较抗虫品种栽培。 

(3)晚秋或春季根据虫害发生情况,在蛹较集中的园内,刨树盘挖捡虫蛹,减少虫害。 

(4)利用成虫趋光性,设置黑光灯诱杀,或在早上人工捕捉。 

(5)化学防治:尽量选择在低龄幼虫期防治。此时虫口密度小,危害小,且虫的抗药性相对较弱。防治时用45%丙溴辛硫磷(国光依它)1000倍液,或国光乙刻(20%氰戊菊酯)1500倍液+乐克(5.7%甲维盐)2000倍混合液,40%啶虫.毒(必治)1500-2000倍液喷杀幼虫,可连用1-2次,间隔7-10天。可轮换用药,以延缓抗性的产生。
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Miss Chen
2 hours ago
Miss Chen
Description: This perennial plant is ¾–2½' long. It either floats on water or sprawls across the ground. The stems are light green to red (often the latter), glabrous to sparsely pubescent, and terete. Alternate leaves along these stems are 1¼–3" long and ½–1" across; they are elliptic, oblong-elliptic, oblanceolate, or oblong-oblanceolate in shape and smooth along their margins. The leaves are usually glossy green in appearance, although sometimes they develop patches of red or yellow. The upper leaf surface is glabrous, while the lower leaf surface is glabrous to sparsely pubescent. The leaf bases taper gradually into slender petioles about ½–2" long. Individual flowers develop from the axils of the middle to upper leaves on erect to semi-erect pedicels about 1–3" long. Each flower is about 1" across, consisting of 5 yellow petals, 5 light green sepals, 10 yellow stamens, and a narrowly cylindrical pistil with a single style. The petals are obovate in shape with pale pinnate nerves, while the smaller sepals are lanceolate. Compared to the size of the flower, both the stamens and style are relatively short. Between the apex of the pedicel and the bottom of the pistil, there is a pair of tiny bractlets (about 1.0–1.5 mm. in length). The blooming period occurs from late spring to early fall, lasting several months. The flowers are diurnal. Afterwards, the flowers are replaced by cylindrical seed capsules about 1–1½" long. Each seed capsule has 5 narrow cells, and each cell contains a row of seeds. The seeds are enclosed in chunky outer coatings (endocarps); they are about 1.0-1.5 mm. in length. The root system is fibrous and fleshy. When the nodes of the stems lie on wet ground, they are capable of developing new fibrous roots, from which new plants are produced vegetatively. Sometimes the root system produces small bladders that keep individual plants more buoyant in the water. This plant often forms large colonies. Cultivation: The preference is full sun, wet conditions, and muddy soil, although this plant can adapt to shallow water as a floating aquatic. Creeping Water Primrose (Ludwigia peploides glabrescens) can spread aggressively in shallow wetlands and muddy areas. It is potentially invasive.
Range & Habitat: Creeping Water Primrose is locally common and native to southern Illinois, while in the rest of the state it is uncommon and probably adventive in most areas (see Distribution Map). This species is slowly spreading northward. Habitats include borders of ponds, shallow areas of lakes, sluggish streams, swamps, marshes, and ditches. In some of these habitats, Creeping Water Primrose can become the dominant shoreline plant, forming large colonies. Faunal Associations: The flowers are cross-pollinated primarily by bees, including honeybees, digger bees (Eucerine), and Halictid bees. Other visitors, such as flies and skippers, are less effective at cross-pollination. These insects obtain nectar and/or pollen from the flowers. Some insects feed destructively on Creeping Water Primrose. This includes the flea beetles, Altica litigata and Lysathia ludoviciana, and a leafhopper, Draeculacephala inscripta. The Mallard and possibly other ducks feed on the seed capsules. Because of the large dense colonies that this plant often forms, it provides good cover along shorelines for various insects, frogs, and other wetland wildlife.
Photographic Location: Muddy shore of a pond in southern Illinois. Comments: Creeping Water Primrose has showy flowers and attractive foliage. Unfortunately, it is sometimes too aggressive for its own good. It can be distinguished from other Ludwigia spp. by its larger 5-petaled flowers and sprawling semi-aquatic habit. Across its range in the United States and tropical America, different varieties of this species have been described, although only var. glabrescens has been found in Illinois. This variety can be distinguished by its more glabrous foliage. Another scientific name of this wetland plant is Jussiaea repens glabrescens, while an alternative common name is Creeping Primrose Willow.
Description: This perennial plant is ¾–2½' long. It either floats on water or sprawls across the ground. The stems are light green to red (often the latter), glabrous to sparsely pubescent, and terete. Alternate leaves along these stems are 1¼–3
Description: This perennial plant is ¾–2½' long. It either floats on water or sprawls across the ground. The stems are light green to red (often the latter), glabrous to sparsely pubescent, and terete. Alternate leaves along these stems are 1¼–3
Description: This perennial plant is ¾–2½' long. It either floats on water or sprawls across the ground. The stems are light green to red (often the latter), glabrous to sparsely pubescent, and terete. Alternate leaves along these stems are 1¼–3
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Article
Miss Chen
2 hours ago
Miss Chen
Description: This is a perennial wildflower about 1½-3½' tall that branches occasionally. The stems are light green, red, brown, or nearly white; they are terete and glabrous (except for an uncommon variety with pubescent stems). The alternate leaves are 1¼-4" long and ¼-¾" across; they are narrowly lanceolate or elliptic, smooth along their margins; sometimes their margins are slightly ciliate or they are tinted red. The leaves are light to medium green and glabrous (except for an uncommon variety with pubescent leaves). The leaves are sessile or they have short petioles (less than ½" in length). Leaf venation is pinnate. Along the upper half of each plant, solitary flowers develop from the axils of the leaves on short pedicels (about 1/8" in length). Each flower is ½-¾" across, consisting of 4 yellow petals, 4 light green sepals, 4 short stamens, and a pistil with a short style. The tip of the style is light green and globular. The petals are oval to obovate in shape, while the sepals are ovate-cordate in shape; both petals and sepals are about the same length. The sepals are glabrous and smooth along their margins; sometimes their margins are slightly ciliate or tinted red. The blooming period occurs during the summer for about 2 months. Each flower remains intact for only a single day; the petals are early-deciduous andDistribution Map become detached when they are exposed to even minor disturbance. Later in the year, the flowers are replaced by seed capsules (about ¼" in length) with a cubic shape that turn brown at maturity. The tiny seeds are released from each capsule by a small pore at its apex. These capsules can float on water or be blown about by the wind, distributing the seeds to new areas. Individual seeds are 0.5-1.0 mm. in length and narrowly ellipsoid in shape. The root system is fleshy and fibrous. Cultivation: The preference is full to partial sun, wet to moist conditions, and an acidic sandy soil, although other soil types are tolerated. Range & Habitat: The native Seedbox is occasional in most areas of Illinois, except in parts of central and northern Illinois, where it is either uncommon, rare, or absent. Habitats include openings in floodplain woodlands, sandy swamps, acidic gravelly seeps, low areas along streams and ponds, wet prairies, wet sand prairies, and roadside ditches. The pubescent variety of Seedbox, Ludwigia alternifolia pubescens, occurs in southern Illinois, where it is uncommon. Faunal Associations: According to Robertson (1929), the flowers of Seedbox are visited primarily by bees, including Halictid bees (Augochlorella spp., Halictus spp., & Lasioglossum spp.) and leaf-cutting bees (Megachile spp.); the bees suck nectar or collect pollen from the flowers. Less common floral visitors include Sphecid wasps, small butterflies, beetles, and other insects. Some insects also feed on the foliage and other parts of Seedbox. These species include the leaf beetle Colaspis suggona, the flea beetle Altica litigata, and caterpillars of the moth Eudryas unio (Pearly Wood Nymph). White-Tailed Deer occasionally browse on the foliage during the summer. Photographic Location: Edge of a sandy swamp at the Heron Boardwalk in Vermilion County, Illinois.
Comments: Seedbox has showier flowers than most Ludwigia spp., and its cubic seed capsules have a distinct appearance. As a result, it is fairly easily to identify when either the flowers or seed capsules are present. Species in this genus are usually found in wetlands. Species in a related genus of the Evening Primrose family, Epilobium spp. (Willow-Herbs), have similar foliage and prefer similar habitats. They can be distinguished from Ludwigia spp. by their narrowly cylindrical seedpods and the presence of tufts of hair on their seeds.
Description: This is a perennial wildflower about 1½-3½' tall that branches occasionally. The stems are light green, red, brown, or nearly white; they are terete and glabrous (except for an uncommon variety with pubescent stems). The alternate leaves are 1¼-4
Description: This is a perennial wildflower about 1½-3½' tall that branches occasionally. The stems are light green, red, brown, or nearly white; they are terete and glabrous (except for an uncommon variety with pubescent stems). The alternate leaves are 1¼-4
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Miss Chen
2 hours ago
Miss Chen
Description: This perennial plant is 1-4' tall. It is erect and usually remains unbranched. The central stem is light to medium green, terete or angular, and glabrous to sparsely hairy. The alternate leaves are up to 5" long and 2" wide; they are oblanceolate, obovate, ovate, or broadly elliptic in shape, and their margins are serrated. The lower leaves clasp the central stem, while the upper leaves are sessile. The upper surfaces of leaves are medium to dark green and sparingly covered with short hairs. The central stem terminates in a spike-like raceme of flowers about ½-2' long. The flowers are 1-1½" long, angled upward, and densely distributed along the raceme. Each flower has a blue-violet corolla (rarely white) that is narrowly bell-shaped (campanulate) and 2-lipped. The upper lip has 2 slender erect lobes that curve slightly inward or backward, while the lower lip has 3 descending lobes that are oblong-lanceolate. Near the throat of the flower at the base of the lower lobes, there is a pair of small white patches. The green calyx is deeply divided into 5 linear-lanceolate teeth; it is conspicuously hairy. The calyx teeth are long and spreading. The blooming period occurs from late summer into fall, lasting about 2 months. Afterwards, the flowers are replaced by capsules containing small seeds. These seeds are probably distributed by wind or water to some extent. The root system consists of a central taproot, fromDistribution Map which occasional basal offshoots are produced. Cultivation: The preference is wet to moist soil and partial sun. Full sun is tolerated if the soil is consistently moist, and light shade is also acceptable. The soil should be fertile and loamy. This plant withstands occasional flooding, but it will become muddy and ragged-looking if it receives too much abuse. The small seeds require light to germinate. Great Blue Lobelia can be highly variable in height, depending on environmental conditions and its stage of development. Range & Habitat: The native Great Blue Lobelia occurs throughout Illinois, except for a few counties in southern Illinois. It is occasional to locally common. Typical habitats include moist black soil prairies, soggy meadows near rivers, low areas along rivers and ponds, floodplain and bottomland woodlands, woodland borders, bottoms of sandstone canyons along streams, swamps, fens, gravelly seeps and springs, ditches, and moist areas of pastures. Great Blue Lobelia can be found in both disturbed areas and high quality habitats. Faunal Associations: The nectar and pollen of the flowers attract primarily bumblebees and other long-tongued bees (Anthophora spp., Melissodes spp., Svastra spp.). Less common visitors include the Ruby-Throated Hummingbird, large butterflies, and Halictid bees. The Halictid bees collect pollen only and they are non-pollinating. The caterpillars of a moth, Enigmogramma basigera (Pink-washed Looper Moth), feed on the foliage of Great Blue Lobelia (Schweitzer & Roberts, 2007). Most mammalian herbivores don't eat this plant because the foliage contains several toxic alkaloids, chief among them being lobeline and lobelanine. These toxic substances produce symptoms that resemble nicotine poisoning. However, it has been reported that deer occasionally eat this plant, perhaps enjoying greater immunity to these toxic substances than other animals. The seeds are too small to be of much value to birds. Photographic Location: The photographs were taken at a garden of the Anita Purves Nature Center in Urbana, Illinois.
Comments: Great Blue Lobelia is a lovely plant that produces some welcome diversity with its violet-blue flowers during late summer or fall, when forbs with yellow flowers are typically dominant. Unfortunately, its value to wildlife is rather limited. Among the Lobelia spp. with bluish flowers in Illinois, Great Blue Lobelia has the largest flowers and they are usually a more deep shade of blue-violet, making it easy to identify.
Description: This perennial plant is 1-4' tall. It is erect and usually remains unbranched. The central stem is light to medium green, terete or angular, and glabrous to sparsely hairy. The alternate leaves are up to 5
Description: This perennial plant is 1-4' tall. It is erect and usually remains unbranched. The central stem is light to medium green, terete or angular, and glabrous to sparsely hairy. The alternate leaves are up to 5
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Miss Chen
2 hours ago
Miss Chen
Description: This perennial wildflower is ½-1½' tall and either branched or unbranched. The slender stem(s) is light green to purple. Alternate leaves about ½-2" long and 1-5 mm. across occur along the stem(s). The leaves are light to medium green, linear to linear-oblong in shape, and usually smooth along their margins. The central stem and any lateral stems terminate in racemes of flowers; the flowers are distributed sparsely along the rachis of each raceme. Each flower is ¼-½" across, consisting of a 2-lipped tubular corolla that is light blue (rarely white), a bell-shaped (campanulate) calyx with 5 slender teeth that are light green to purple, 5 stamens, and a 2-celled ovary with a single style. The stamens tightly surround the style. The upper lip of the corolla is divided into 2 small narrow lobes, while the lower lip is divided into 3 large lobes. At the base of the corolla's lower lip, there is a conspicuous patch of white; sometimes this patch becomes yellow along its upper boundary near the throat of the corolla. The corolla is hairless throughout, while sometimes the bottom of the calyx is pubescent. The slender pedicels of the flowers are ¼-1" long; they are light green to purple and either glabrous or minutely pubescent. Toward the middle of each pedicel there is a tiny linear bractlet; at the base of each pedicel there is a linear bract that is about the same length as the pedicel. The blooming period occurs from mid-summer to early fall and lasts about 1 month. Afterwards, the flowers are replaced by seed capsules about 4 mm. across; each capsule splits open at its apex to release numerous tiny seeds that are narrowly oblongoid and compressed (somewhat flattened) in shape. The seeds are small enough to be blown about by the wind or transported by water. The root system is shallow and fibrous. Cultivation: The preference is full sun, wet to consistently moist conditions, and soil that is sandy to sandy-peaty and calcareous. Episodic periods of shallow water are tolerated. Range & Habitat: The native Kalm's Lobelia occurs in northern Illinois, where it is uncommon (see Distribution Map). Illinois lies along the southern range limit of this species. Habitats include grassy fens, wet sandy meadows, borders of interdunal swales, low areas along springs, and bogs. This conservative species is found in high quality wetlands where the original flora remains intact.
Faunal Associations: Very little is known about floral-faunal relationships for this species. The flowers are probably cross-pollinated by various bees and small butterflies. Like other Lobelia spp., Kalm's Lobelia has an acrid sap that is more or less toxic to mammalian herbivores. Photographic Location: A fen in NE Illinois. The photographs were taken by Lisa Culp, Copyright © 2011. Comments: This is one of the less common Lobelia species in Illinois. Kalm's Lobelia has a delicate beauty that derives from its pastel blue flowers and slender foliage. It is somewhat similar in appearance to Pale-Spiked Lobelia (Lobelia spicata), but its leaves are more narrow (less than ¼" across). Other Lobelia species in the state also have wider leaves, and some species have larger flowers. Another common name of Lobelia kalmii is Brook Lobelia.
Description: This perennial wildflower is ½-1½' tall and either branched or unbranched. The slender stem(s) is light green to purple. Alternate leaves about ½-2
Description: This perennial wildflower is ½-1½' tall and either branched or unbranched. The slender stem(s) is light green to purple. Alternate leaves about ½-2
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Miss Chen
2 hours ago
Miss Chen
Description: This herbaceous perennial plant is usually unbranched and 2–3½' tall. The central stem is light green, terete, and sparingly to densely hairy. The alternate leaves are up 6" long and 1½" across, but they are typically about one-half of this maximum size. The rough-textured leaves are lanceolate in shape and coarsely serrated along their margins; they have a tendency to curl upward along their central veins. The lower leaves have short petioles, while the upper ones are sessile. The undersides of leaves usually have fine hairs. The central stem terminates in a spike-like raceme of showy red flowers (rarely white). This raceme is about ½–1½' long. The red corolla of each flower has a narrow tubular structure that is upright and terminates in grayish white reproductive organs; these organs nod downward. Beneath this are 2 narrow lateral lobes and a lower lip that is 3-lobed. The green calyx is deeply divided into 5 linear teeth that spread outward. The flowers are held at an upward angle in relation to the stem; they are about 1–1½" long and ¾–1" across. The blooming period occurs from late summer to early fall, lasting about 1–1½ months. There is no floral scent. The small seeds can be carried aloft by the wind. The root system consists of a taproot.
Cultivation: The preference is light shade to full sun, and wet to moist conditions. Cardinal Flower adapts to loam, sandy loam, or gravelly soil; the soil should contain some organic matter to retain moisture. This plant doesn't like to dry out and it has a reputation of being temperamental and short-lived. It is easier to establish this plant using transplants, as the seeds are quite small and the young seedlings are rather fragile.
Range & Habitat: The native Cardinal Flower has been observed in most counties of Illinois; it is occasional to locally common in southern Illinois, while in northern and central Illinois it tends to be less common or absent (see Distribution Map). Habitats include wet prairies, prairie swales, openings in floodplain and bottomland woodlands, soggy meadows along rivers and streams, gravelly seeps and springs, borders of ponds, edges of small marshes, and ditches. These habitats include both sandy and non-sandy areas. Cardinal Flower is often found in sunny areas near sources of water, or it is found in open woodland areas where moist depressions occur.
Faunal Associations: The nectar of the flowers attracts the Ruby-Throated Hummingbird and various Swallowtail butterflies, including such species as Papilio polyxenes asterias (Black Swallowtail), Papilio troilus (Spicebush Swallowtail), and Battus philenor (Pipevine Swallowtail). Sometimes the larger bumblebees will steal nectar through slits in the tubular corolla. Halictid bees sometimes gather pollen, but they are ineffective at pollination. The larvae of a polyphagous fly, Metopomyza scutellata, mine the leaves of Cardinal Flower. The caterpillars of a moth, Enigmogramma basigera (Pink-washed Looper Moth), also feed on the leaves (Schweitzer & Roberts, 2007). The seeds are too small to be of much interest to birds. Mammalian herbivores usually don't consume this plant because of the toxic white latex in the foliage. While it's a beautiful plant, the ecological value of Cardinal Flower to wildlife is relatively low. Photographic Location: Most of the photographs were taken by the webmaster at Meadowbrook Park in Urbana, Illinois; the plants were growing in a prairie swale. The photograph of a Cardinal Plant with rare white flowers was taken by Paul Showers (Copyright © 2013) in northeast Illinois.
Comments: The Cardinal Flower has striking red flowers that remind me of the Northern Cardinal and other exotic birds. Red is an unusual color in wildflowers – an attribute that it shares with Silene regia (Royal Catchfly) and Silene virginica (Fire Pink). Plants with red flowers typically attract hummingbirds; sometimes they also attract Swallowtail butterflies because their compound eyes, unlike those of bees, can detect the color red. The Cardinal Flower is often sold at garden centers, but such plants are often hybrids or special cultivars. One such hybrid is Lobelia X speciosa, which is a genetic cross of Lobelia cardinalis and Lobelia siphilitica (Great Blue Lobelia). This hybrid can naturalize in the wild, and resembles the former species to a greater extent than the latter. Its flowers are often magenta or deep rose, rather than brilliant red.
Description: This herbaceous perennial plant is usually unbranched and 2–3½' tall. The central stem is light green, terete, and sparingly to densely hairy. The alternate leaves are up 6
Description: This herbaceous perennial plant is usually unbranched and 2–3½' tall. The central stem is light green, terete, and sparingly to densely hairy. The alternate leaves are up 6
Description: This herbaceous perennial plant is usually unbranched and 2–3½' tall. The central stem is light green, terete, and sparingly to densely hairy. The alternate leaves are up 6
Description: This herbaceous perennial plant is usually unbranched and 2–3½' tall. The central stem is light green, terete, and sparingly to densely hairy. The alternate leaves are up 6
Description: This herbaceous perennial plant is usually unbranched and 2–3½' tall. The central stem is light green, terete, and sparingly to densely hairy. The alternate leaves are up 6
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