圓柏大痣小蜂(Aegastigmus sabinae Xu et He)生物生态学研究

STUDIES ON THE BIOECOLOGY OF MEGASTIGMUS SABINAE

圆柏大痣小蜂分布于青海、甘肃省,危害圆柏属种子,在青海省危害面积达22万亩,种子平均被害率为23.71％,严重影响了圆柏的育苗和更新。我们试图弄清它的生物生态学习性,为防治提供科学依据,于1986—1987年,在这方面做了观察和研究。一、虫种及其形态特征(图1) 圆柏大痣小蜂为长尾小蜂科(Callimomidae),大痣小蜂属(Megastigmus)

Megastigmus sabinae Xu et He is the most injurious insect pest of the seeds of Sabina. It has one generation a year in Qinghai Province. The larva feeds on the embryo of seeds and overwinters as third instar larva. The peak of emergence of the adult is at last ten days of July. The temperature is an important factor directly influencing the growth and development of the pest. The insect den-sity are complete positive correlation with embryo numbers.