摘要
根据对桑树上桑蓟马虫口密度的调查,明确其分布主要集中在桑枝3 ~10 叶位上,最高虫叶位随桑树的树势强弱而变化。桑蓟马虫口数量受气候变化的影响较大,高温干旱期,桑蓟马虫口数量猛增,桑树受害最重;风雨有碍桑蓟马的发生,每次可减少桑蓟马21% ~88 % 。通过田间调查,桑蓟马的主要天敌有:大草蛉、中华草岭、横纹蓟马及一些瓢虫和小蜘蛛等。
Investigation showed that mulberry thrips were mainly concentrated on a branch section from the 3rd to the 10th leaf. The more vigorous a mulberry tree, the closer the thrips were distributed towards the branch top. Climate had a significant effect on the population of the thrips. During a hot and dry period, the thrips population increased sharply, causing a heavy damage. Wind and rain could decrease the thrips by 21% to 88%. It was found in the field survey that the natural enemies of mulberry thrips were mainly of Chrysopa septempunctata, C. sinica, Aeolothrips fasciatus, lady beetles and some small spiders.
出处
《宁夏农林科技》
1999年第6期20-22,共3页
Journal of Ningxia Agriculture and Forestry Science and Technology
关键词
桑树
桑蓟马
分布规律
天敌
mulberry, mulberry thrips, distribution , natural enemies