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山东聊城县利用冬油菜在棉田春种,诱集、繁殖天敌控制棉蚜,1981年示范面积3,200亩,取得了良好效果。冬油菜在3月下旬至4月上旬棉花播种前预播,也可与棉花同期播种,每隔10行棉花种1行油菜,油菜不占棉行,种在棉垄背上,大背行距2.8-3尺。选甘蓝型冬油菜,叶片直立、棵大,有益于天敌的生活。当6月下旬气温升高,油菜枯萎,天敌转移到棉田上,即可铲除。油菜上的蚜虫主要是菜缢管蚜和桃蚜,诱集的天敌90％来自麦田的瓢虫类。天敌迁移期在小麦黄熟后,高峰期在小麦收割期,据1980年在小麦收割期(6月上、中
Liaocheng County, Shandong Province, the use of winter rapeseed varieties in spring cotton, trapping and reproduction of natural enemies to control cotton aphid, demonstration area of 3,200 mu in 1981, and achieved good results. Winter rapeseed in late March to early April cotton before sowing can also be planted with cotton over the same period, every 10 lines of cotton plant a row of rape, rape does not account for the cotton line, planted in cotton ridge, large back row 2.8 -3 feet. Selected cabbage-type winter rape, erect, big tree, beneficial to the natural enemies of life. When the temperature rose in late June, rape wilt, natural enemies transferred to cotton fields, you can eradicate. The aphids on rape are mainly aphid and peach aphid. 90% of the natural enemies are ladybugs from wheat field. The natural enemies of the migration period after the yellowing of wheat, the peak in the wheat harvest, according to the 1980 wheat harvest (June, in