新疆南疆棉区食虫蝽类天敌的群落结构

在新疆南疆,我们对棉花、苜蓿、马铃薯、新疆杨和苦豆子5种植物上的食虫蝽类天敌的数量和发生情况进行了调查。食虫齿爪盲蝽、姬蝽(华姬蝽和原姬蝽)和微小花蝽数量分别占总数的63 30%、26 68%和10 02%,这些食虫蝽在棉花上占总数的27 91%,苜蓿上占23 31%,苦豆子、马铃薯和新疆杨上的分别占总数的23 58%、17 62%和7 59%。不同植物上的食虫蝽数量在不同调查年度间没有明显规律。食虫蝽在6月中下旬和8月上中旬大体出现两个高峰期,在6月下旬苜蓿上的食虫蝽数量非常高,为棉田害虫防治提供了应用可能。

Community Structure of Predatory Bugs in South Xinjiang Cotton Planting Areas

The number and occurrence of predatory bugs on cotton, alfalfa, potato, poplar and sophora were investigated in south Xinjiang cotton planting areas in China. Deraeocaris punctulatus, Nabis spp. (N. sinoferus and N. ferus) and Orius minutus were the main species. They occupied 63.30%, 26.68% and 10.02% respectively of the total bugs collected. There were 27.91% and 23.31% of predatory bugs collected from cotton and alfalfa, and 23.58%, 17.62% and 7.59% respectively from potato, poplar and sophora. The number of predatory bugs on different crops was not stable between years. Predatory bugs presented two peaks a year in mid-late June and early-mid August. Large number of bugs found on alfalfa in late June, will help the control of insect pests on cotton.