棉红铃虫田间产卵规律的进一步研究

在棉株结铃前，红铃虫一代卵主要分布于棉株新展开叶上。在棉花单株结铃达2．5个左右时，红铃虫卵均集中分布于棉青铃上。红铃虫二、三代卵分别以由外到内第二、三和第三、四大铃圆锥体位上的青铃卵量分布最多，分别占全株卵量的58．56％和67．19％红铃虫在10天以上日龄的青铃上均可产卵，其中在20～34天日龄的青龄上产卵量最大，占青铃上总卵量的55．02％。一代和二、三代红铃虫卵常分别1～8粒和1～13粒聚产成堆，单个青铃上可同期产卵1～16粒。

Fur ther studies on the egg-laying patterns of the cotton pink bollworm (Pectinophora gossypiella Saunders) in the field

When there were no green bolls on a cotton plant, of the females of the first generation of cotton pink bollworm (Pectinophora gossypiella Saunders) laid eggs on the tender leaves. While there were over 2.5 green bolls on a cotton plant, the eggs of the second and third generatious were largely laid on the green bolls on the middle and lower fruit branches of tbe cotton plants. The eggs of the second generation of this insect were laid about 58.56% on the cotton bolls of the 2nd and 3rd conic layer from outer to inner. and 67. 19% on the 3rd and 4th layer during the third gene-ration. Females of the insect mostly selected the green bolls over 10 days old to lay their cggs, and the number of eggs on the bolls of 20-34 days old reached 55.02% The eggs are into the lumps of 1-8 grains at the first generation and 1-13 grains at the second and third generaion. On each green boll, about 1-16 grains of the eggs can be laid at one time.