摘要
麦棉套种田害虫为害对棉花生育及产量的影响比单作棉田大，因此单作棉田的防治指标在套种田无法应用。研究证明，适合套种田棉蚜棉铃虫的单独防治指标是苗蚜卷叶株率２０％，２代棉铃虫百株幼虫１２头；相继两次为害的复合指标为苗蚜卷叶株率５％，２代棉铃虫百株幼虫１２头；相继３次为害的复合指标为苗蚜卷叶株率５％，棉铃虫百株幼虫２代为８头，３代为６头；相继４次为害的复合指标为苗蚜卷叶株率５％，伏蚜百株三叶蚜量１万头，棉铃虫２代、３代百株幼虫均为６头。
In the field of cotton intercropped with wheat,the influence of insectpest damage on cotton development and its yield was more severe than that in sole cropping cotton field. Therefore, the control index for sole cropping cotton fields can not be applied to cotton intercropped with wheat. The research result proved that the following control index could be applied to cotton intercropped with Wheat,i. e., 20% of plants were curled leaves damaged by seedling aphids and there were 12 second generation cotton bollworms (CBW) every 100 plants; the complex control index(CCL) of sequential damage for 2 times was 5 % of curled leave plants damaged by seedling aphids and 12 CBW of 2nd generation every 100 plants; the CCL of sequential damage for 3 times was 5% of curled leave plants damaged by seedling aphids and 8 CBW of second generation and 6 CBW of third generation every 100 plants; the CCL of sequential damage for 4 times was 5% curled leave plants damaged by seedling aphids, the population of aghids in hot summer as 10 000 3-leaf aphids every 100 plants and 6 CBW of 2nd and third larval respectively every 100 plants.
出处
《山西农业科学》
1996年第4期36-39,共4页
Journal of Shanxi Agricultural Sciences
关键词
棉蚜
棉铃虫
防治指标
小麦
棉花
套作
Cotton intercropped with wheat
Cotton aphid
Cotton bollworm
Control index
