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为探究威百亩在不同土壤环境条件下的消毒效果,采用离体和活体方法研究施药量、覆膜熏蒸时间、土壤相对含水量及土壤温度对威百亩熏蒸防治黄瓜枯萎病的作用效果。结果表明,25℃条件下,威百亩12 mg(a.i.)/kg土壤熏蒸消毒,对尖孢镰刀菌Fusarium oxysporum的抑制率为78.82%,对黄瓜枯萎病的防治效果为87.03%,且对作物安全无药害;威百亩对尖孢镰刀菌的熏蒸抑制作用随着熏蒸时间的增加而增强,土壤熏蒸10 d后对尖孢镰刀菌的抑制率为95.21%;土壤相对含水量为30%和50%时,威百亩对黄瓜枯萎病的防治效果分别为72.32%和82.14%,含水量过高或过低均不利于药效的发挥,而且还会对作物产生药害反应。威百亩的熏蒸效果随着土壤温度的升高而增强,在25、30、35℃时对黄瓜枯萎病的防治效果分别为80.18%、98.20%和100.00%。表明威百亩结合日光消毒温度大于25℃、土壤相对含水量为30%或50%、熏蒸10~15 d可有效控制土壤中尖孢镰刀菌引起的黄瓜枯萎病。
In order to explore the disinfecting effect of Wei-mu under different soil environmental conditions, the effects of applying the dosage, the fumigation time of the film, the relative water content of the soil and the soil temperature on the fusarium wilt of Viagra were studied by in vitro and in vivo methods . The results showed that under the condition of 25 ℃, Fusarium oxysporum Fusarium oxysporum was 78.82% and the control effect on Fusarium oxysporum fusarium wilt was 87.03% and 12 mg (ai) Safe and harmless. The inhibition of Fusarium oxysporum fumigation with Fusarium oxysporum fumigatus increased with the increase of fumigation time. After 10 days of fumigation, Fusarium oxysporum inhibition rate was 95.21% and soil relative water content was 30% And 50% respectively, the control effects of Weiweimu on Cucumber Fusarium wilt were 72.32% and 82.14%, respectively. Too high or too low Moisture content was not conducive to the efficacy of cucumber, but also had a phytotoxic response to the crop. The fumigation effect of Weihuai mu increased with the increase of soil temperature. The control effects on cucumber blight were 80.18%, 98.20% and 100.00% at 25, 30 and 35 ℃ respectively. The results showed that the combination of Weihu mu with the sunlight disinfection temperature above 25 ℃ and the soil relative water content of 30% or 50% could effectively control Fusarium oxysporum f.