Field Trials of 20% Tebufenozide SC against Spodoptera exigua Hbner

[Objective] The study was aimed to determine and evaluate control effect and security of 20% tebufenozide SC against Spodoptera exigua HObner, which would provide technical support for its promotion and utilization. [ Method] By using foliar spray method, control effects of different concentration of 20% tebufenozide SC and 25 g/L deltamethrin EC against S. exigua were determined. [ Result] 20% tebufenozide SC had better control effects on S. exigua. After spraying for 3 and 7 d, control effects of 20% tebufenozide SC in each treatment could reach 81% and 84%, which was higher than 25 g/L deltamethdn EC treatment. [ Conclusion] 20% tebufenozide SC for controlling S. exigua had good effect, which had permanent effectiveness for over 7 d. It also caused less environmental pollution, and was safe to cabbage, being the ideal pesticide for controlling S. exigua in vegetables.

甜菜夜蛾被淡足侧沟茧蜂寄生后的生理变化

研究了甜菜夜蛾2龄末～4龄初幼虫被淡足侧沟茧蜂寄生后,寄主体重、发育进度及氨基酸含量的变化。结果表明:被寄生幼虫较对照幼虫体重降低,虫体总氨基酸含量增加,而血淋巴内氨基酸含量减少,其中含量增加的氨基酸有酪氨酸Tyr、赖氨酸Lys和精氨酸Arg;含量减少的氨基酸有苏氨酸Thr、丝氨酸Ser、甘氨酸Gly、蛋氨酸Met、异亮氨酸Ile、组氨酸His和脯氨酸Pro,且甜菜夜蛾被寄生幼虫发育进度减慢,表明寄生后淡足侧沟茧蜂需要一定的历期才完成其生长发育。

糖含量对甜菜夜蛾生长发育的影响

研究了不同糖含量对于甜菜夜蛾Spodoptera exigua(Hübner)幼虫生长发育和成虫繁殖力的影响。结果显示随着糖含量的增加,甜菜夜蛾幼虫历期缩短,存活率增加,繁殖力增高。表明,食料糖含量的增高对甜菜夜蛾的种群增长有促进作用。