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20 0 2～ 2 0 0 3年 ,用 2 2 %吡·毒乳油 1 5 0 0、2 0 0 0和 2 5 0 0倍液进行防治苹果绵蚜的田间试验。结果表明 ,喷药后第 2天 ,即有大量蚜虫死亡 ;喷药后第 1 0天 ,3种浓度的吡·毒防治效果均达 90 %以上 ,其中 1 5 0 0倍和 2 0 0 0倍液的有效控制期达 3 0天 ,且两年的防治效果均超过了 95 %。
Field trials of cotton aphid against apple aphids were carried out with 20% to 25% Pyrethrin 150, 20000 and 2000 times in 2020 ~ 2003. The results showed that on the second day after spraying, a large number of aphids died. On the day 0 after spraying, the control efficacy of three concentrations of the two viruses reached more than 90%, of which 1500 times and 20 000 Times effective control period of 30 days, and two years of control over 95%.