大头金蝇羽化过程的观察研究

Observation on Eclosion Process of Chrysomya megacephala

目的 :研究和了解大头金蝇的羽化习性 ,寻找和利用大头金蝇的薄弱环节而进行防制。方法 :从现场采集大头金蝇Ⅲ龄幼虫 ,带回实验室饲养、化蛹 ,进行羽化过程和昼夜羽化规律观察。结果 :大头金蝇蛹 1d内的羽化大多在夜间 ,占 88.81% ,午夜 (2 1～ 2 4时 )是高峰 ,自然羽化率为 44 .67% ;该蝇外部形态和行为方式在各个时期都有明显的不同。结论 :大头金蝇蛹羽化至成蝇是否可以分成 5期 ,将值得商榷 ,即I期为乱爬期 ,Ⅱ期为伸展期 ,Ⅲ期为变色期 ,Ⅳ期为始飞期 ,Ⅴ期为成虫期。在前 3期中 ,大头金蝇在羽化场所的表面停留时间 (4 2～ 14 8min)很长 。

Objective:To observe and study the eclosion process of Chrysomya megacephala at the laboratory, at the same time,to record in details ecologic changes of each process as well as lightness, temperature, humidity, time, ratio of male and female so as to find its weak stages.Methods:The larva of Ⅲ stage were collected in the field and were breed in lab.It's eclosion process and the eclosion regularity of day and night was observed.Results:The eclosion occured mainly during night about 88.81% . The peak time was from 21-24 o'clock with 44.67% naturel eclosion rate.The shape and behavior varied from stage to stage obviously.Conclusion:The eclosion process may be divided into five stages:Ⅰ crawling stage,Ⅱ stretching stage,Ⅲ colour changing stage,Ⅳ flying stage,Ⅴ adult stage. During the first three stages,the fly stays on the medium surface for a long time (42-148 min).It may be used for the control of them.