扬州地区棉蚜卵的发育动态及早春棉蚜的扩散

摘要

Egg-laying process of cotton aphid Aphis gossypii on its overwintering host Hibiscus syriacus Linn.,and diffusion and immigration dynamics in the following spring were investigated regularly in a fixed spots in Yang-zhou.Egg color,morphological characters of fundatrices and virginoparae,and egg shell were photoed using ster-eoscope.Results showed that most of the newly laid eggs were black,a minority of eggs were jade color and con-verted to black after 2 days.The end of December to the early January was the egg-laying peak season;The over-wintering eggs hatched into fundatrices,and virginoparae occurred in the early April.In the mid-April,alatae ap-peared and started to diffuse.It was found that not all cotton aphids turned into alatae to emigrate from the win-ter host.This study will provide a scientific basis for the forecast and management of the cotton aphid in the early spring.%采用定点定期的调查方法，结合体视镜（舜宇 SZ45-ST1）对各虫态拍照，研究了扬州地区棉蚜在越冬寄主木槿上的卵色变化、产卵历程以及次年的扩散迁移动态。结果表明，棉蚜的初产卵大多数为黑色，部分为翡翠色并且2 d 后转为黑色；12月末至1月初为棉蚜产卵盛期，3月中下旬越冬卵孵化为干母，4月初出现干雌，4月上中旬为无翅蚜，4月中旬出现有翅蚜并开始扩散。观察发现，不是所有的棉蚜都形成有翅蚜迁离冬寄生。研究结果为棉蚜的预测预报和早春棉蚜的治理进一步提供了科学依据。