摘要
利用赤眼蜂携带棉铃虫ＮＰＶ病毒防治第２、３、４代棉铃虫,以万灵、甲胺磷化学杀虫剂防治作对照。结果显示:赤眼蜂对棉铃虫卵的寄生率平均为３３．３%。最高达到３７．３%;棉铃虫幼虫病毒感染死亡率为６１．３%到７０．６%;赤眼蜂带病毒防治田天敌数量、种类明显多于化学杀虫剂防治田,瓢虫、蜘蛛、小花蝽平均百株数量比化学杀虫剂防治田分别高８３．６%、１００．８%、６９．２%,在赤眼蜂带病毒防治田存在的草蛉、猎蝽等捕食性天敌在化学杀虫剂防治田未发现:赤眼蜂带病毒防治田平均虫口减退率为６６．１９%,化学杀虫剂防治田为７０．２５%,差异不显著(ｐ＝０．０５);赤眼蜂带病毒防治田棉花的平均花蕾虫害率为３５．９７%与化学杀虫剂防治田的３４．９３%差异也不显著(ｐ＝０．０５)。
Releasing Trichogramma carrying NPV to suppress the second, third and fourth generations of H. armigera, chemical control field was treated by pesticide. Results showed that the average parasitism rate of Trichogramma to the eggs of H. armigera in the releasedg Trchogramma field was 33. 3% , the utmost was 37. 3% . The infect death rate of H. armigera by NPV was from 61. 3% to 70. 6% . Natural enemies including Coccinellids、Arane and Orius similis in the released Trichogramma field, which average quantity per hundred plants were 83. 6% , 100. 8% and 69. 2% more than those of the chemical control field respectively. Chrysopa, and Reduvii, the kinds of natural preying enemies, could be found in the released Trichogramma field, butcould not be found in the control field. The average decrease rate of the population density of H. armigera in the released Trichogramma field was 66. 1 %, that of the chemical control field was 70. 25 % , the difference of them was not significant. The average damage rate of the flower bud in the released Trichogramma field were close to that in the chemical control field.
出处
《昆虫天敌》
CSCD
2002年第1期20-25,共6页
Natural Enemies of Insects
关键词
棉铃虫
赤眼蜂
NPV病毒
防治效果
Helicaverpa armigera
Trichogramma
NPV
effect of suppressing
