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氧乐果药液浓度、雾滴密度与小麦蚜虫防治效果关系紧密 ,室内定量喷雾试验表明 :雾滴体积中径 (VMD)为 85μm,氧乐果药液浓度 1.0、1.5、2 .0、3.0 g· L-1条件下 ,蚜虫致死 90 %时雾滴覆盖密度 L N90 分别为 336 .1、2 37.6、2 0 8.8和 115.3cm-2 ;氧乐果雾滴覆盖密度为 2 6、50、10 2 cm-2 条件下 ,蚜虫致死 90 %药液浓度 L C90 分别为 2 9.5、7.2和 4 .0 g· L-1。田间采用泰山 - 18BC机动喷雾机水平顺风喷雾 ,雾滴中径 (VMD)为 173μm,施药液量75L· hm-2 和 150 L· hm-2 条件下 ,麦穗上平均雾滴沉积密度分别为 132 cm-2 和 2 80 cm-2 ;药液浓度分别为 1.2、1.6、2 .0和 2 .4、3.2、4 .0 g· L-1时 ,对麦蚜的防治效果差异不明显。生产中用泰山 - 18BC机动喷雾机防治麦蚜时 ,建议采用 75L· hm-2施药液量和 2 .4 g· L-1氧乐果药液。
The concentrations of the omethoate and the droplet density were closely related to the control effect of wheat aphids. The indoor quantitative spray test showed that the droplet diameter (VMD) was 85μm, the concentration of omethoate was 1.0, 1.5, 2.0, 3.0 g · L-1 conditions, 90% of the aphids when the droplet coverage density L N90 were 336.1,2 37.6,2 0 8.8 and 115.3cm-2; omethoate droplet coverage density of 26,50, Under the condition of 10 2 cm-2, 90% of the lethal concentration of aphids was 29.5, 7.2 and 4.0 g · L-1, respectively. Field application of Taishan-18BC motor sprayer horizontal downwind spray, droplet diameter (VMD) of 173μm, spray volume of 75L · hm-2 and 150 L · hm-2, Was 132 cm-2 and 2 80 cm-2, respectively. There was no significant difference in the control effect on wheat aphids when the drug concentrations were 1.2, 1.6, 2.0 and 2.4, 3.2 and 4.0 g · L-1, respectively . Production Taishan - 18BC mobile sprayer to prevent wheat aphid, it is recommended to use 75L · hm-2 liquid volume and 2 .4 g · L-1 omethoate.