棉田种植诱集作物对天敌的保护及增殖作用

THE EFFECTS OF ATTRACTIVE CROPS INTERPLANTED IN COTTON FIELD ON THE PROTECTION AND PROPAGATION OF NATURAL ENEMIES OF COTTON INSECT PESTS

1987—1988年在河北省邯郸地区的试验结果表明,在棉田种植油菜及高粱诱集带,棉花主要害虫发生期内捕食性天敌数量比对照田增加25—51％;当棉田施用化学农药时,诱集带对保护天敌、促使捕食性天敌数量回升的效果明显。两种诱集作物综合种植的相互衔接,对保护、增殖天敌和控制害虫作用明显优于单一种植高粱诱集带。

The effects of rape and sorghum as two attractive crops inter-planted between or in cotton rows on the natural enemies of cotton insectpests were studied in 1987—1988 in Handan Prefecture,Hebei Province.During the occurrence period of main cotton insect pests,the predatorsnumber in interplanted cotton field were 25—51% more than those inmonoculture cotton field.There was obvious benefit of interplanted cottonfield on the conservation and restoration of predators after insecticidespraying.Since the growth periods of the two attractive crops were insuccession,the insect pests control function in cotton field interplantedwith the two attractive crops was significantly better than those inter-planted with sorghum alone.