Jones J W, Weathersbee A A, Efird P, Meisch M V
Department of Entomology, University of Arkansas, Fayetteville 72701.
J Am Mosq Control Assoc. 1990 Sep;6(3):496-9.
Four application rates of Bacillus sphaericus strain 2362 were tested for efficacy in septic ditches against Culex quinquefasciatus 2nd-4th instar larvae. Trials were conducted over a 2-year period. In 1987, all dosages applied to dairy effluent ditches resulted in substantial reductions after 48 h. Differences among dosages did not differ significantly (P greater than or equal to 0.05). After 5 days, mosquito larval numbers increased with dosage rates of 0.6, 0.9 and 1.2 liters/ha. Residual control was maintained, however, at 2.4 liters/ha for 17 days. In 1988, B. sphaericus applied to domestic sewage effluent ditches at rates of 1.2 liters/ha, and 2.4 liters/ha induced greater than 79% suppression for a period of 15 days, and the 1.2 liters/ha rate induced greater than 79% suppression for a period of 20 days. A rate of 0.9 liters/ha provided good to excellent control (greater than 88%) for a period of 10 days. A rate of 0.6 liters/ha produced less than 50% suppression after 48 h.
对球形芽孢杆菌菌株2362的四种施用量进行了测试，以评估其在污水沟中对致倦库蚊二至四龄幼虫的防治效果。试验持续了两年。1987年，施用于奶牛场废水沟的所有剂量在48小时后均导致幼虫数量大幅减少。各剂量之间的差异不显著（P大于或等于0.05）。5天后，当施用量为0.6、0.9和1.2升/公顷时，蚊虫幼虫数量增加。然而，当施用量为2.4升/公顷时，残留防治效果维持了17天。1988年，以1.2升/公顷和2.4升/公顷的施用量将球形芽孢杆菌施用于生活污水沟，在15天内抑制率超过79%，而1.2升/公顷的施用量在20天内抑制率超过79%。0.9升/公顷的施用量在10天内提供了良好至极佳的防治效果（超过88%）。0.6升/公顷的施用量在48小时后抑制率低于50%。
