垂柳瘿叶蜂生物学特性和防治方法的研究

Bionomics and control of Pontania sp.in Shenyang,China

垂柳瘿叶蜂Ｐｏｎｔａｎｉａｓｐ．在沈阳严重为害柳树。该虫在沈阳１年发生１代，以老熟幼虫于表土中结茧越冬。成虫于５月上旬开始出现；幼虫生活于无毛、闪现着红色近卵形或近豌豆形虫瘿中；虫瘿表面具瘤状颗粒，着生于叶背中脉上。已知其寄生天敌２种，即啮小蜂Ｔｅｔｒｏｓｔｉｃｈｕｓｓｐ．和沈阳宽唇姬蜂ＬａｔｈｒｏｓｔｉｚｕｓｓｈｅｎｙａｎｇｅｎｓｉｓＸｕｅｔＳｈｅｎｇ。以２．５％溴氰菊酯（敌杀死）乳油３０００倍液于５月上旬至中旬喷洒成虫效果很好。

The sawfly Pontania sp.is an important pest of willows in Shenyang,China.It has one generation a year and overwinters as mature larva in cocoon in the surface layer of the soil.The adults begin to appear in early May.The larvae live in glabrous,red flushed oval or near pea shaped galls covered with warts and attached to the mid vein on the underside of the leaves,chiefly of Salix babylonica L..Two species of parasitoides are found from the pest,namely, Tetrastichus sp.and Lathrostizus shenyangensis Xu et Sheng.Spraying 2.5%Decis emulsion at 3000× dilution to the adults during early May and mid May was very effective for control of the pest.