化学药剂长期连续使用会使葡萄霜霉病菌对部分药剂产生抗药性。通过采用离体叶盘法,测定嘧菌酯和烯酰吗啉及两者的混用对葡萄霜霉病菌的毒力作用。结果表明,95%嘧菌酯、98%烯酰吗啉及两者的5个配比(1:1、1:2、2:1、1:4、4:1)对葡萄霜霉病菌的EC50值分别为7.9003、1.7656、1.454、1.685、1.0117、1.9688、3.2009μg/m L。其中嘧菌酯:烯酰吗啉为2:1时对葡萄霜霉病菌生长的抑制作用较强,可以用于防治葡萄霜霉病的田间试验。
Long-term continuous use of chemicals will cause drug resistance of Plasmopare viticola. By usingleaf disc method, the toxicity of azoxystrobin, dimethomorph and their mixtures against Plasmopare viticola were tested. The results showed that the EC50 of 95% azoxystrobin, 98% dimethomorph and their five ratios(1:1, 1:2, 2:1, 1:4, 4:1) was respectively 7.9003, 1.7656, 1.454, 1.685, 1.0117, 1.9688, 3.2009 μg/m L. Themixture of azoxystrobin and dimethomorph at the ratio of 2:1 had very strong inhibiting effect on Plasmopare viticola and could be used to control grape downy mildew in field experiment.