防治棉铃虫的药剂田间筛选试验研究初报

PRELIMINARY STUDY ON THE FIELD SCREENING FOR SOME INSECTICIDES AGAINST COTTON BOLL WORM

1991年通过对15种农药、43个处理防治棉铃虫第二代自然发生群体的田间药效试验表明:在当代始落卵孵化初期1次施药,效果较好的有爱力螨克和抑太保;卡死克和硫丹用较大剂量也有较好的效果;而Bt可湿性粉剂单独使用效果较差;在低龄幼虫期施药,以拉维因和多虫清的效果最好,其次为万灵,均能达到减虫、保蕾目的;马氰菊酯较低稀释倍数下防治效果亦较明显;而好年冬和多来宝减虫效果较低,蕾铃受害较重;氰戊菊酯或敌杀死与增效醚按有效成分比例混合施用,基本上可达到与菊酯类单剂相当的防治效果,且成倍地降低菊酯类的有效剂量。

Field efficacy tests were carried out in 1991 for screening some insecticides against cotton bollworm (CBW) Heliothis armigera Hubner. 43 treatments with 15 insecdcides and synergists were applied to control second generation CBW. The results showed that the desirable chemicals with only one spraying needed at early hatching stage to keep CBW under control were agrimec and atabron, and cascade and thiodan at higher dosage levels, while the spraying of wettable Bt powder alone got rather poor effect. As spraying at young larval stage, larvin and polytrin C were most effective and lannate ranked at the second on the mortality of CBW and square protection, and rather high concentration (1:500-1000) of the mixture of 5% fenvalerate + 15% malathion also got better efficacy; but the results of marshal and trebon were poor. Fenvalerate or decis mixed in certain proportion with PBO got similar effects but might significantly reduced the dosages of these pyrethroids.