河曲丝叶蜂在北京地区的生物学特性及防治研究

Bionomics and control of Nematus hequensis in Beijing

河曲丝叶蜂Nematus hequensis Xiao危害柳树。该虫在北京地区1 a发生1代,以老熟幼虫在土中越冬,翌年8月初化蛹,8月中上旬开始羽化,8月中旬为产卵盛期,幼虫开始出现。施用4.5%高效氯氰菊酯乳油和1%苦参碱可溶性液剂虫口减退率分别为94.4%和91.3%。

Nematus hequensis attacked Salix spp.. It had one generation a year and overwintered as mature larva in the soil. It pupated in early August the next year. The adult emerged in the beginning and mid of August and the peak of oviposition was in mid August. The larva hatched in mid August. The population reduced by 94. 4% and 91.3% respectively when beta-cypermethrin 4.5% 1 500 times and matrine 1% 1 000 times were applied.