三突花蛛在落叶松人工林内生物学及作用的初步研究

STUDY ON BIOLOGY OF MISUMENOPS TRICUSPIDATUS AND ITS IMPACT ON LARCH PLANTATION

三突花蛛在东北地区一年一代，越冬龄期不整齐。在落叶松林内，早春上树捕食害虫。６月中旬后，下迁至林下的灌木丛和草上，在植物叶上做囊产卵。该幼蛛自孵化起至越冬前，不再主动向高树冠部迂移，而仅在灌木、草上及小树上活动。三突花蛛能捕食多种林木害虫，在早春，其种群密度往往高于其它害虫天敌，是一种极有利用前途的天敌。

Misumenops tricupidatus is often present in larch(Laricx olgensis)plantation in forest region of Jilin province.It is a major natural enemy of larch pest insects.There are slightly different instars in the same time. It overwinters in the submature and larva stage.From early May to mid-June,it preies on Cinara laricis, Adelges laricis and the larvae of Coleophora dahurica etc.,It appears to be most abundant in the larch plantation.From early July to mid-August the female deviate from larch crown and ovipost undersurface of leaves of shrubs and grass.The new larval spiders only occupy on grass and shrubs and can not be found above 1.5 in height of larch. This paper also explained its ecological factors,predatory action, and the measures that the spiders are protected and applicated.