42%寡糖·硫磺悬浮剂对西瓜白粉病的田间防效

Field Control Efficiency Study of a 42%Oligose-Sulfur Suspension Agent Against Watermelon Powdery Mildew(Erysiphe cichoracearum)

为进一步明确42%寡糖·硫磺悬浮剂对西瓜白粉病的防治效果,进行了田间防效试验。结果表明,42%寡糖·硫磺悬浮剂对西瓜白粉病具有良好的防治效果。第一次施药后10d防效达50.84%~65.94%,第二次药后7d防效达62.03%~75.91%,第二次药后14 d防效达67.81%~80.77%。其中,高浓度(945.0 g/hm^(2))和中浓度(630.0 g/hm^(2))处理的防效优于对照药剂5%氨基寡糖素水剂(52.5g/hm^(2)),低浓度处理(378.0g/hm^(2))的防效则与对照药剂5%氨基寡糖素水剂相当;高浓度处理的防效显著高于对照药剂50%硫磺悬浮剂(1 525.0 g/hm^(2)),中浓度处理的防效和对照药剂50%硫磺悬浮剂相当。根据试验结果可知,在试验剂量范围内对作物安全,42%氨基·硫磺悬浮剂可以在西瓜上推广使用。推荐有效成分用药量为630~945 g/hm^(2),每公顷用药液750 L,隔10 d喷一次,连续喷2次。

A field efficacy test was conducted to clarify the ability of a 42%oligose-sulfur suspension to control watermelon powdery mildew.The results showed that a 42%oligose-sulfur suspension could control watermelon powdery mildew.The control effect reached 50.84%to 65.94%ten days after the first application,62.03%to 75.91%seven days after the second application,and 67.81%to 80.77%14 days after the second application.Among them,the control effect of high concentration(945.0 g·hm^(-2))and medium concentration(630.0 g·hm^(-2))was better than that of control agent 5%aminooligosaccharide water agent(52.5 g/hm^(2)),and the control effect of low concentration treatment(378.0 g·hm^(-2))was similar to that of control agent 5%aminooligosaccharide water agent.The control effect of high-concentration was significantly higher than that of the 50%sulfur suspension agent(1525.0 g·hm^(-2)),and the control effect of medium-concentration treatment was similar to that of the control agent 50%sulfur suspension agent.The efficacy of the high-concentration treatment was significantly greater than that of the control agent.525.0 g·hm^(-2)),and the efficacy of the medium-concentration treatment was comparable to that of the 50%sulfur suspension.According to the test results,it is safe for the crop within the test dose range,and a 42%oligose-sulfur suspension can be popularized for use on watermelon.The recommended dosage of the active ingredient is 630-945 g·hm^(-2),750 L of liquid per hectare,sprayed once every 10 d,and sprayed two times continuously.