银杏叶枯病的田间药剂防治试验

用 4种药剂和 2种药剂组合防治银杏叶枯病的田间试验。示范结果表明 :扑海因 +甲基托布津 ,敌力脱防效最好 ;与其它的参试药剂相比 ,其防效有显著差异。从始病期 (4月中下旬 )开始 ,每隔 1 5 d左右 ,用 2 5 %敌力脱 2 0 0 0倍液 ,5 0 %扑海因 1 0 0 0倍液 + 70 %甲基托布津 1 0 0 0倍液 (按 1∶ 1的体积比混合 )交替喷药 1次 ,特别是在 6月 1 0日和 7月 30日左右的发病高峰前必须重点施药 ,防治效果就可达到 85 %以上 ,有效控制叶枯病的发生。研究结果还表明 ,喷药的时间不同 ,防治效果不同 ;用药时能加强病害综合防治的其它措施 ,防治效果也会有显著的提高。

Field trials on the chemical control of Ginkgo leaf blight

Four chemicals and two mixtures of chemicals to control Gingko leaf blight are tested in field with the result that Rovral mixed with Thiophanatemethy, and Propiciazole are found to have better control effects. Their control effects are significantly different from the other chemicals tested. The control effect could raise up to 85% if Propiconazole at 1.25×10 -4g·mL -1, and Rovral at 5×10 -4g·mL -1+Thiophanatemethy at 7×10 -4g·mL -1(mixed by 1∶1 according to volume) are sprayed by turn at 15-day intervals as early as the disease occurs around mid-April, and if these two kinds of chemicals are intensively sprayed before the occurrence of fastigiums (June 10th～July 30th). The results also indicate that the control effects of these chemicals could be different if sprayed at different time. Moreover, the control effects can be greatly improved if other measures are taken when spraying.