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我们从1976年至1979年陆续通过农田调查和室内人工饲养工作,观察了七星瓢虫在自然界或是人工饲养条件下,都产生滞育,并逐代上升,生殖能力明显衰退.现将结果:介绍如下.材料和方法1.越冬代成虫观察.将秋季从蔬菜田采回的越冬代成虫在冬季或翌年春天用莱蚜饲喂,每瓶一头雌成虫,一般观察35—60天结束.2.冬季、早春饲养时,养虫室采用煤炉通过烟筒增温,保持25±2℃,另在电炉上
From 1976 to 1979, one after another through farmland surveys and indoor artificial rearing, we observed that the ladybird of Diaphanus did not produce diapause in nature or artificial breeding, The introduction is as follows.Materials and methods 1. Observation of overwintering adult worms The overwintering generation adults recovering from vegetable fields in autumn are fed with Leveiruber in winter or the following spring, one female adult in each bottle, and the end is generally observed in 35-60 days.2 In winter and early spring feeding, the feeding room is heated by a chimney through a chimney to maintain a temperature of 25 ± 2 ℃ and another on the electric stove