毒死蜱与阿维菌素增效混配制剂对斑潜蝇属害虫的防治效果

通过有机磷杀虫剂毒死蜱与生物源农药阿维菌素混配制剂对美洲斑潜蝇Liriomyza sativae室内毒力实验，测定共毒系数为165～234，处于明显增效范围内。据此确定最佳配比和次佳配比，配制该增效混剂30%渗透型可湿性粉剂-1和-02，在山东防治美洲斑潜蝇幼虫的田间试验表明药效优良。制剂用量50 g/667m²药后3，7，11天，两可湿粉的校正防效分别为90.43%～91.71%和87.09%～90.53%，可湿粉-1用量25 g/667m²防效为85.96%～88.28%，可湿粉-2用量37.5 g/667m²相应校正防效为84.01%～85.38%，两增效混剂防治斑潜蝇速效性和持效性皆佳，成本有所下降，且对南美洲斑潜蝇L. huidobrensis亦有较好防效。使用可湿粉与乳油相比较可减少投放入环境的化学品数量。

The efficacy of the synergistic mixtures of chlorpyrffos and abamectin in controlling leafminers Liriomyza spp

The co-toxicity co-efficiency (CTC) of a series of mixtures of abamectin as a biological pesticide, and chlorpyrifos as a phosphate insecticide with low toxicity to mammals, were determined with respect to the leafminer Liriomyza sativae. CTC of these mixtures was equal to 165-234 and within a range of marked synergism. According to the maximum and submaximum of proper proportions of chlorpyrifos to abamectin, two synergistically mixed, 30% permeated formulations, WP-1 and WP-2, were manufactured. Field trials showed that both compounds were highly effective in controlling L. sativae larvae. At an application rate of 50g/667 m², the corrected mortalities of WP-1 and WP-2 after 3, 7 and, 11 days were 90.43%-91.71% and 87.09%-90.53% respectively; at 25 g/667 m², the corresponding control effects of WP-1 were 85.96%-88.28%; and at 37.5g/667m², the corrected mortality of WP-2 was 84.01%-85.38%. These synergistic mixtures were fast acting, had good residual performance and were economical to use. In addition, 30% WP-1 was also effective in controlling L. huidobrensis. The advantage of using WP over EC is that less toxic substances are released into the environment.