不同药剂对白萝卜霜霉病药效试验研究

Study on the Efficacy of Different Pesticides against Downy Mildew of Ternip

摘要: 选用烯酰•噻霉酮、丙森•霜脲氰、霜霉•精甲霜、氟胺•氰霜唑、氟菌•霜霉威5种药剂对白萝卜霜霉病进行防治试验，结果表明：前三次施药前后未发病，各种药剂对白萝卜霜霉病都有较好的预防效果。第四次施药前已发病，施药后十天的防效为：丙森•霜脲氰、霜霉•精甲霜、氟胺•氰霜唑3种药剂的防效在75%~80%；烯酰•噻霉酮的防效是80.58%，而氟菌•霜霉威的防效为86.48%，高于其它药剂的防效。

Abstract: Five kinds of pesticides, Dimethomorph-Thiazolone (water dispersible granule), Cinson zinc-Cynosine (water dispersible granule), Frostweed-Metalaxyl (aqueous solution), Fluoroamine-Cyanosole (suspension concentrate), Flufenamide-Frostweed (suspension concentrate), were used to prevent the downy mildew of ternip (Raphanus sativus). The results showed that no incidence was observed after three rounds of application of each pesticide. It indicated that all the five pesticides formulations had a good preventive effect on downy mildew to ternip. However, the disease was observed before the fourth application. And the control effect after ten days of the 4th application was described as below. Cinson zinc-Cynosine (water dispersible granule), Frostweed-Metalaxyl (aqueous solution), Fluoroamine-Cyanosole (suspension concentrate) indicated control effect ranged from 75% to 80%; Dimethomorph-Thiazolone (water dispersible granule) showed effect at 80.58%; while Flufenamide-Frostweed (suspension concentrate) at 86.48%, which was the best of the five pesticides.