6种杀菌剂对马铃薯晚疫病菌的室内毒力测定

Toxicity Test of Six Fungicides in vitro to Phytophthora infestans from Potatoes

试验采用生长速率法测定了双炔酰菌胺、恶酮.霜脲氰、氟菌.霜霉威、烯酰.松脂酮、丙森锌.霜脲氰、代森锰锌6种杀菌剂对马铃薯晚疫病菌的毒力。结果表明,供试6种杀菌剂对马铃薯晚疫病菌丝生长都有良好的抑制效果。双炔酰菌胺的毒力最强,其EC50值为0.029μg/mL,恶酮.霜脲氰、丙森锌.霜脲氰、烯酰.松脂酮、氟菌.霜霉威毒力依次减弱,而代森锰锌毒力最差,其EC50值为5.502μg/mL。根据室内毒力测定结果及药剂特性,供试的6种杀菌剂在田间防治上可视病害的发生情况交替或混合应用,做到科学合理搭配,以避免或延缓抗药性的产生。

The toxiciUes of six fungicides（Mandipropamid, Famoxadone .cymoxanil, Fluopicolide .propamocab hydro chloride, Dimethomorph@ copper abietate, Propineb @ cymoxanil and Mancozeb） to Phytophthora infestans were determined by the method of growth rate in vitro. These tested fungicides had a better inhibiting effect on mycelial growth of P. infestans, of which Mandipropamid was the best one, with EC50 value being 0.029 μg/mL, followed by Famoxadone.cymoxanil, Propineb. cymoxanil, Dimethomorph .copper abietate, Fluopicolide .propamocab hydrochloride and the worst one was Mancozeb, whose EC50 value was 5.502 μg / mL. Based on the toxicity estimation in vitro and their characteristics, the six tested fungicides could be alternately and reasonably used to control the potato late blight in order to avoid or delay the occurrence of fungicide resistance in potato production.