20%苍耳素乳油对苹果斑点落叶病的田间药效试验

Field Control Effect of 20% EC of Cangersu on Alternaria mali

田间药效试验结果表明:20%苍耳素乳油对苹果斑点落叶病具有很好的防效,20%苍耳素乳油500倍、300倍和100倍3种处理剂量在春稍停止生长后10 d的防效分别为69.7%、81.6%和85.9%,其中100倍液防治效果与20%的多菌灵防效80.9%呈显著差异;在末次施药后10 d供试药剂3个处理剂量的防效分别为65.5%、76.2%和78.8%,对照药剂50%多菌灵则为77.5%,方差分析表明,20%苍耳素乳油300倍、100倍液防效与对照药剂防效相当。

The field control trial of 2 0% EC of Cangersu on A lternaria mali was conducted. The result showed： the control effects of 500, 300 and 100 times solutions of 20% EC of Cangersu of 10 days after the first control at the stage of spring treetop stopping growth were 69.7%, 81.6% and 85.9% respectively and its control effect of 100 times solution was significantly better than the 80.9% control effect of 50% WP of carbendazim; the control effects of 3 different concentrations of 20% EC of Cangersu of 10 days after the final control were 65.5%, 76.2% and 78.8% respectively whereas the effect of 800 times solution of 50% control carbendazim was 77.5%. The variance analysis indicated that the control effects of 300 and 100 times solution of 20% EC of Cangersu were almost equal to the effect of control pesticide of 50% carbendazim.