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以Bt-15A3烟雾剂采用3WF-2.6型背负式喷雾喷粉机进行超低量喷雾,对小菜蛾进行田间药效试验。结果表明:Bt-15A3烟雾剂的供试剂量为1312.5mL/hm2和1575mL/hm2时对幼虫有较理想的防效,防效分别达到83.56%和90.07%。对于世代重叠严重的田块,应在药后7d进行补施,以达到彻底控制小菜蛾危害的目的。
The Bt-15A3 aerosol was sprayed by 3WF-2.6 knapsack sprayer to conduct field efficacy test on Plutella xylostella. The results showed that the optimum dosage of Bt-15A3 aerosol was 1312.5mL / hm2 and 1575mL / hm2, respectively. The control effect was 83.56% and 90.07% respectively. For generations of overlapping plots, should be supplemented 7d after the drug in order to achieve the ultimate goal of controlling diamondback moth damage.