二点委夜蛾卵巢发育分级及在预测预报中的应用

对室内饲养的二点委夜蛾Athelis lepigone(Moschler)雌成虫分时段进行解剖,观察其卵巢的结构及发育进程。结果显示二点委夜蛾具有1对卵巢,各由4个卵巢小管组成。发育进程可分为5个阶段:透明期、卵黄沉积期、成熟待产期、产卵盛期和产卵末期。河北省石家庄地区2011年7月下旬至8月上旬田间卵巢发育的监测结果显示,Ⅰ级卵巢在整个发生期所占比例较高,Ⅳ级卵巢所占比例较低,推测其下一代幼虫的发生量将较低,并与田间调查结果吻合,因此卵巢解剖分级法可以用于二点委夜蛾的预测预报工作。

Grading criteria for assessing the ovarian development of Athetis lepigone and its use in forecasting

The structure and developmental process of the ovaries of Athetis lepigone （Moschler） were observed by dissecting females at different stages of development maintained in a laboratory. The results indicate that the female reproductive system consists of paired ovaries and that each of the two ovaries consists of four polytrophic ovarioles, Ovarian development of the female reproductive system was classified into five stages, including a transparent, vitellogenesis, mature, egg-laying and late egg-laying stage. The ovarian development of A. lepigone was monitored in Shijiazhuang, Hebei Provience from early July to late August of 2011. This revealed that the 1st developmental grade was more abundant than the 4nd grade throughout the entire period of occurance. These results are consistent with those obtained from field investigations. It is therefore possible to predict the peak oviparous period of the next generation by monitoring the female reproductive system of the current generation.