摘要
油松毛虫2～5龄幼虫,按体背倒状鳞毛及各体节的斑纹形状和颜色,可以分为两种类型。体背倒状鳞毛为浅黄色,第1～7个腹节背面各有一黄色斑纹,明显成亚铃形的黄色型,体背倒状鳞毛为灰黑色,斑纹暗黄色,不明显呈亚铃形的黑色型。5龄幼虫经脱皮变成6龄幼虫后,体背的亚铃形斑纹不再存在,但体背倒状鳞毛的颜色仍不变。调查表明,林分的虫口数的大小与越冬幼虫的色型比有关。黑色型幼虫体重增长率较高,雌蛹较重。色型比对害虫的预测预报有意义。
The 2-5 instar larvae of Dendrolimus tabulaeformis can be divided into two kinds of color marphs, the yellow morph and the black morph, according to the color and shape of the dorsal scales and streaks. The yellow morph possess the following characteristics, the dorsal scales and setaes are yellowish, there is one yellow streak on each of the 1-7 abdomen segment dorsums and the shape of the streak is dumbbell-shaped. The distinguishing characteristics of the black morph which separateir from the yellow morph are. the dorsal scales and setaes are greyish-black and the shape of the dorsal streaks is not clear. After moulting from 5 instar to 6 instar, the dorsal streaks disappear but the color of the scales and setaes do not change. From the results of field investigation, it can be seen that population density of-hibernating larvae is related to the ratio of color morphs. The black morph larvae have faster body growth and female pupae have heaver body weight than yellow morph larvae. Therefore the studies on color morph are significant to the forecasting of experiments with the pest.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
1989年第3期66-70,共5页
Journal of Beijing Forestry University
关键词
幼虫
油松毛虫
色型
虫龄
害虫
Dendrolimus tabulae formis, Color morph, Instar
