棉花绿盲蝽在东营地区发生危害规律及防治技术研究

Study on Occurrence Regularity and Control Technique of Lygus lucorum in Dongying Region

棉花绿盲蝽在东营地区危害加重的主要原因是棉花与冬枣间作模式有利于其生长发育,加之抗虫棉大面积种植,农药用量减少,虫口密度进一步增加。调查结果显示,棉花绿盲蝽在东营一年发生5代,前两代危害最重,第1代危害高峰在4月下旬至5月上旬,第2代危害高峰在6月中旬,栆棉间作田重于单纯棉田。防治用药以氟虫腈、甲氰菊酯和马拉硫磷防治效果最好,用药后第3天防效分别为97.1%、95.3%和95.0%,用药后第7天防效分别为93.3%、87.3%和86.1%。

In Dongying region,Lygus lucorum occurred more rampantly and seriously caused mainly by the intercropping of cotton and winter jujube,the large-scale cultivation of Bt cotton and the reduced application of pesticide.The investigation results showed that Lygus lucorum occurred 5 generations every year in Dongying region,and the first two generations damaged the most seriously.The harmful peak of the first generation was present in the last ten days of April and the first ten days of May,while that of the second generation appeared in the middle ten days of June.The damage degree in the intercropping fields of cotton and winter jujube was higher than that in the cotton monoculture field.Such effective pesticides could be used to control Lygus lucorum as fipronil,fenpropathrin and malathion.On the third day after pesticide application,their control effects were 97.1%,95.3% and 95.0% respectively,while on the seventh day,those were 93.3%,87.3% and 86.1% repectively.