番茄晚疫病田间防治试验

Experimental Study on Control of Phytophythora infestans

为有效控制当地番茄晚疫病的发生,选用当前市场上广泛应用的4种番茄晚疫病防治药剂75%百菌清、80%烯酰吗啉、霜脲·锰锌和5%氨基寡糖素,对当地主栽番茄品种进行田间药效防治试验,旨在筛选出对番茄晚疫病具有显著防效的药剂。试验结果表明除75%百菌清以外,其余3种药剂的二次防效均高于一次防效,防效最高的药剂为5%氨基寡糖素(防效65.03%)。第一次施药时处于病害始发期,第二次施药时处于病害高峰期,病情指数达到40以上,表明施药对于此阶段的病害发生控制作用不显著。对比9个处理的防效结果,除75%百菌清用药后病情指数略高于对照以外,其余6个处理施药后的病情指数均低于对照,表明适时喷药对于晚疫病的防治仍具有一定效果。

In order to effectively control the occurrence of\%Phytophythora infestans,four kinds of chemical fungicides(75%chlorothalonil WP,80%dimethomorph WG,Cymoxanil mancozeb WP,5%Oligochitosan AS)were selected to test its control effects on Ai’li.The results showed that the secondary control effects of the other three fungicides were higher than the primary control effects except for 75%chlorothalonil WP,and the most effective fungicide was 5%oligochitosan AS(65.03%).The first application was in the initial stage of disease,and the second application was in the peak stage of disease.The disease index reached more than 40 at the second application,indicating that the application had no significant effect on disease control at this stage.Compared with the control results of the 9 treatments,except for 75%chlorothalonil,the disease index was slightly higher than the control,the other 6 treatments were all lower than the control,indicating that the timely spraying of Phytophythora infestans was still effective.