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采用6HYC-42A型热烟雾机喷施10%苯醚甲环唑WG防治温室黄瓜白粉病,以背负式手动喷雾器常规喷雾为对照,比较了不同施药方式的农药在黄瓜植株不同部位的雾滴沉积分布规律以及对白粉病防效的差异。同时,利用液质联用检测了热烟雾法喷施苯醚甲环唑在黄瓜果实、叶片及土壤中的残留及消解动态。试验结果表明:1热烟雾法的雾滴体积中径为15μm,手动喷雾法的雾滴体积中径为215μm。2热烟雾法施药,黄瓜叶片正面的雾滴沉积密度明显高于叶片反面。当热烟雾机背靠日光温室北墙、喷头向南在黄瓜行间对空喷雾时,农药雾滴在黄瓜上部、中部、下部的雾滴沉积分布都表现为距离喷口越远密度越大。热烟雾法的雾滴沉积密度明显大于手动喷雾法。3采用热烟雾法喷施苯醚甲环唑,在有效成分用量为5.0、6.7、8.3 g/667m2时,对黄瓜白粉病的防治效果分别为81.4%、94.4%、97.9%,而手动喷雾法在相同有效成分用量时防效为74.2%、78.4%和83.6%。4热烟雾法施药时苯醚甲环唑在黄瓜果实中的原始沉积量为0.008 3 mg/kg,远低于UK/EC制定的苯醚甲环唑在黄瓜中最高残留量限值0.10 mg/kg。
The spraying of 10% difenoconazole WG by 6HYC-42A thermal fogger was used to control the cucumber powdery mildew in greenhouse. Compared with the conventional sprayer of knapsack sprayer, the spray of different pesticides in different cucumber plants was compared. Sediment distribution law and the control effect on powdery mildew. At the same time, the residue and digestion dynamics of difenoconazole in cucumber fruits, leaves and soil were detected by LC-MS method. The experimental results show that the diameter of droplet of a hot smoke method is 15μm, and the droplet volume diameter of a manual spray method is 215μm. 2 hot smoke method of application, the front of the cucumber leaf droplet deposition density was significantly higher than the opposite leaf. When the hot fogger backs the northern wall of the solar greenhouse, the sprayhead sprays to the south in the space between the cucumber rows, and the droplet distribution of the droplets in the upper, middle and lower parts of the cucumber appears as the greater the density away from the jet. The thermal fog method droplet deposition density was significantly greater than the manual spray method. The spraying of difenoconazole by hot smog method showed that the control effect on cucumber powdery mildew were 81.4%, 94.4% and 97.9% at the dosage of 5.0, 6.7 and 8.3 g / 667m2, respectively. However, The control efficacy was 74.2%, 78.4% and 83.6% at the same dosage of active ingredients. 4. The initial deposition of difenoconazole in cucumber fruit during hot-smoking method was 0.008 3 mg / kg, which was much lower than the limit value of difenoconazole in cucumber set by UK / EC 0.10 mg / kg.