晋中地区甘蓝蚜对杀虫剂的敏感性变化及药剂混配的增效作用

为了了解甘蓝蚜对药剂的敏感性变化及药剂混配的增效作用,采用FAO推荐的微量点滴法,测定了山西省晋中地区田间甘蓝蚜种群对药剂的敏感性、相对敏感基线,及不同类型杀虫剂混配的增效作用。结果表明:甘蓝蚜对杀虫剂的敏感性降低,对啶虫脒、高效氯氰菊酯和齐螨素抗药性为原来的11.10倍、14.34倍和16.13倍,对氰戊菊酯、辛硫磷和吡虫啉的抗药性为原来的83.33倍、101.50倍和143.38倍,对灭多威的抗药性为原来的161.75倍;混配增效试验结果表明,辛硫磷和灭多威以有效成分1∶0.5,高效氯氰菊酯和齐螨素以1∶3、1∶6和1∶9混配后都具有明显的增效作用。

The Susceptiblicity Changes of Bressicae Brassicae From Jinzhong Region to Insecticides and the Synergistic Effect of Combinations

Using microtitrimetry method,the susceptibility of brevicoryne brassicae to pesticides and the base-line was determined.Synergism effects of combinations between different insecticides were also conducted.The results indicated that the susceptibility of brevicoryne brassicae to pesticides had declined.The resistance to acetamiprid,beta-cypermethrin and abamectin had raised(11.10,14.34 and 16.13-fold),to fenvalerate,phoxim and imidacloprid had raised(83.33,101.50 and 143.38-fold);to methomyl had raised mostly(161.75-fold).Experimental results demonstrated that phoxim mixed with methomyl in 1∶0.5a.i;beta-cypermethrin mixed with abamectin in 1∶3a.i、1∶6a.i and 1∶9a.i all had significant synergism to the pest than used alone.