【摘要】 通过拒食活性的生物学观察和刺吸电位技术（EPC）研究了夹竹桃、香樟、银杏和番茄等4种植物的鲜叶水溶性提取物对棉蚜取食行为的影响。结果表明:4种植物的水溶性粗提液和氯氰菊酯具有明显的拒食效应,而且拒食效果随着浓度的提高和作用时间的延长而提高,但当作用时间从2 h 增加到4h 时,香樟、番茄水溶性粗提液对棉蚜的拒食效果却明显下降。因此,香樟和番茄水溶性粗提液中起拒食驱避作用的成分很可能具挥发性。EPC 分析显示:4种粗提液和氯氰菊酯使棉蚜有效取食（E₁、E₂和 G 波）的持续时间极显著地缩短,E₁、E₂波持续时间分别缩短至对照的29%以下和23%以下,G 波持续时间缩短至对照的56%以下;寻找取食部位（C 波）的持续时间显著延长,而此过程中棉蚜口针短暂穿刺植物细胞膜（pd 波）的频率明显减少;除香樟外,还极显著地延长棉蚜的非取食行为（np 波）的持续时间（2倍以上）。因此,与氯氰菊酯一样,夹竹桃、香樟、银杏和番茄等4种植物的鲜叶水溶性提取物显著影响棉蚜取食行为。更多还原

【Abstract】 The feeding behaviors of cotton aphid,Aphids gossypii,on melon,Cucumis melo,treated with aqueous extracts of rosebay（Nerium indicum）,camphor tree（Cinnamomum cam-phora）,ginkgo（Ginkgo biloba）and tomato（Lycopersicon esculentum）were studied by usingbiological assay and electrical penetration graph（EPG）.It was found that the four kinds of a-queous exacts had a stronger antifeeding effect when the concentration of aqueous exacts washigher or the feeding time was longer.However,after 2 hours,the antifeeding effect of cam-phor tree′s and tomato′s aqueous extracts declined.This was probably due to their volatile com-ponents.EPG analysis revealed that the effective feeding durations （E₁,E₂ and G）were short-ened,the seeking（C）time was prolonged and the penetration（pd）frequency during C wasreduced by these four kinds of plant′s aqueous extracts or cypermethrin significantly when A.gossypii fed on melon treated with them.These aqueous extracts and cypermethrin also pro-longed non-penetration（np）time except C.camphora.So,these aqueous extracts had verysignificant effect on the feeding behavior of A.gossypii,as cypermethrin did.更多还原