棉田亚洲玉米螟生物学的研究

STUDIES ON THE BIOLOGY OF ASIAN CORN BORER ON COTTON

亚洲五米螟为棉花上一种重要的钻蛀性害虫。该虫产卵于棉株中下部主茎叶和果枝叶上，但二、三代代次之间产卵部位有明显差异。幼虫可为害棉株的嫩头、叶柄、蕾、花、铃、茎秆等多个器官，棉花同一器官上各龄幼虫之间的分布、以及同龄幼虫在棉花不同器官之间的分布，均存在显著差异。１头幼虫一生破坏棉花器官的单位数二代为３．３７３个，三代为２．２０２个。二年的试验结果表明，田间二代亚洲玉米螟种群趋势指数差异大。三代幼虫越冬场所广泛。

Ostrinia furnacalism,an important pest on cotton,lays its eggs on the leaves ofmain stem and fruit-branch under the middle of cotton. The oviposition site of asian cornborer is distinctly variable between the 2nd and 3rd generation,Its larvae feed on manycotton organs : such as on the growing points,flowers,bolls,stems etc. The larvaldistribution greatly varied among the different instars on a same organ of cotton and a certaininstar on the different cotton organs.A larva can damage 3. 373 units of cotton organs on the2nd generation and 2.202 units on the 3rd generation.The trend index of population on the2nd generation and the overwintering sites of the 3rd generation of larvae are variable.