截形叶螨春季活动规律

对截形叶螨在树干上的越冬分布、出蛰后的转移规律、耐饥饿能力、爬行速度、寄主杂草等进行为期2 a的研究。截形叶螨在枣树主干树皮裂缝、主枝和树干基部的土壤缝隙中均能越冬,其中距地面60 cm左右的主干是主要越冬场所,越冬数量占总虫数的70%,主枝次之。从树干不同方位上的越冬情况来看,主干南面越冬数量最多。出蛰后的成螨沿树干转移取食。其耐饥饿时间为24~104 h、死亡高峰期间为56~80 h。这为冬季和早春用树干捆草圈诱杀、刮老树皮、喷洒农药等措施来降低越冬虫口密度和树干涂抹毒环诱杀、阻止转移以及清除灰绿藜等措施来控制截形叶螨提供了理论依据。

Activities of Tetranychus truncatus Ehara on Zizyphus jujube in Akesu in Spring

Two years study was carried out to investigate winter distribution, migration of awaken insects, starvation hardiness, the crawl velocity, and miscellaneous grasses, on Tetranychus truncates (Ehara) . The study discovered that Tetranychus truncatus Ehara could live through the winter in cracks and main trunk of tree, as well as in soil cracks near to the basilar of tree trunk, and insects lived mainly on the tree trunk ranging 60cm above ground, accounting for 70% of total number of insects, insects on the main branch were less. Most of insects lived on the southern trunks. Awaken insetcts moved around and took foods along the tree trunk, bearing 24 ~104 h starvation with the peak range of death during 56~80 h. The results gave the foundation for the control methods of Tetranychus truncatus Ehara in winter and early spring, such as reducing the overwintering population density through luring insects with the grass rings winding around the tree trunks, scraping old barks of the trees, spraying pesticide, as well as killing insects with drug ring booby traps coated on the tree trunks and cutting the migration route of insects, removing Chenopodium glaucum Linn. etc.