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小猿叶虫(Phaedon brassicae Baly)是十字花科蔬菜重要害虫之一,本市春秋二季发生猖獗。据文献记载,小猿叶虫以成虫越冬。我们经近4年调查观察,发现在本市(北纬29.8度,东经121.5度)幼虫也能越冬,继而化蛹并羽化;且大多幼虫在越冬期晴好天气仍能活动取食。现把调查概况报道如下。1987年12月1日起,在本市西郊乡选择小猿叶虫为害较重的一块大白菜(面积0.2亩),进行系统越冬虫态调查(5天一次,每次查100株菜),先后查到幼虫12头,其中
Phaedon brassicae Baly is one of the important pests of cruciferous vegetables. It is rampant in spring and autumn. According to the literature, the small-leaf-worm to adult wintering. After nearly 4 years of investigation, we found that larvae in this Municipality (29.8 degrees north latitude and 121.5 degrees east longitude) were able to winter and then pupae and eclosion. Most of the larvae were still able to feed on sunny days in wintry weather. The survey is now reported as follows. Since December 1, 1987, a large piece of Chinese cabbage (area 0.2 mu), which is severely damaged by the small monk bug, was selected in the western suburbs of this Municipality to conduct systematic investigation of the overwintering state of insects (once every 5 days for 100 vegetables) , Has found 12 larvae, of which