马铃薯晚疫病CARAH预警模型在四川春马铃薯上的应用

为明确马铃薯晚疫病CARAH预警模型在四川春马铃薯上的适用性,选择在四川不同海拔高度的马铃薯种植基地运用CARAH预警模型监测马铃薯晚疫病的发生和进行防控指导。结果表明,海拔高度越高,马铃薯晚疫病侵染程度越低,海拔3500 m以上时,主要以轻度侵染为主,海拔3500 m以下时,主要以中度和重度侵染为主。不同品种出现中心病株时的马铃薯晚疫病侵染循环代数不同,相同品种在不同地区出现马铃薯晚疫病中心病株时所处的侵染循环有所差别,可能与不同地区马铃薯晚疫病菌致病力存在差异有关。利用马铃薯晚疫病CARAH预警模型指导药剂防治,5种药剂仍表现出较高的防治效果,且不存在显著性差异。

Application of CARAH Warning Model Against Potato Late Blight in Sichuan Spring Potato

To clarify the applicability of CARAH warning model against potato late blight in Sichuan spring potato, CARAH warning model was used to monitor occurrence of potato late blight and provide control measures in different altitudes in Sichuan. The results showed that the higher the altitude, the lower infection degree of potato late blight. The major infection degree was mild when the altitude was more than 3500 meters above the sea level, while the major infection degrees were moderate and severe when the altitude was less than 3500 meters above the sea level. Concerning the primarily infected plants, different varieties had different infection cycles of potato late blight, and the same variety at different sites had different infection cycles too, which might be related to the difference ofPhytophthora infestans in different sites. Five fungicides showed good control effects on potato late blight under CARAH warning and had no significant difference.