印楝油对褐稻虱雌虫求偶鸣声和交尾行为的影响

EFFECT OF NEEM OIL ON COURTSHIP SIGNAL AND MATING BEHAVIOR OF THE FEMALE BROWN PLANTHOPPER,NILAPARVATA LUGENS (STAL)

笔者用印楝(Azadirachta indica A.Juss)油点滴褐稻虱[Nilaparvata lugens(stil)]初羽化雌虫背部,点滴量分别为1.0、2.5及5.0μg,或将试虫饲养在分别用3％、6％及9％印楝油乳液喷雾处理过的稻株上。结果表明印楝油对褐稻虱雌虫正常的发声和交尾行为有明显干扰。8.3—25.0％的处理雌虫不能发声,也不交尾;8.3—58.3％发出不正常的求偶鸣声;其余鸣声虽基本正常,但脉冲重复频率增高,鸣叫持续时间缩短。后者可完成交尾,交尾前历时明显延长,但交尾时间与对照无显著差异。

Nilaparvata lugens female adults topically treated with 1.0,2.5,or 5.0μg neem oil or exposed to rice plants sprayed with 3,6,or 9% neem oil emulsion emitted abnormal mating signals in fwrn of substrate vibration.8.3 to 25% treated females failed to produce mating calls.The pulse repetition frequency of signals given off by treated females Increased,but the duration of female call decreased with increasing net-m oil concentration.The premating period was longer with females topically treated with 5μg neem oil or exposed to plants sprayed with 6% neem oil.The duration uf mating in treated insects was not significantly affeeted