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小麦白粉病是小麦生长中、后期一种重要病害,近年发生普遍。随着水肥条件的提高,田间植株稠密,湿度大,对小麦危害日趋严重,轻者减产10％,重者减产60～80％。一、发病规律及发病条件白粉病菌一般以菌丝体在麦苗叶片上越冬到来年春天小麦返青后,病部不断产生分生孢子,随气流传播扩大蔓延,造成田间发病。小麦收获后,病株上的闭囊壳,如遇充分的大气湿度,病孢子传染自生麦苗,自生麦苗上产生的分生孢子再侵染秋季麦苗。
Wheat powdery mildew is an important disease in the middle and late stages of wheat growth, which has been widespread in recent years. With the improvement of water and fertilizer conditions, the plants in the field are dense with high humidity and the harm to wheat is becoming more and more serious. The light yield is reduced by 10% and the heavy output is decreased by 60% -80%. First, the incidence and incidence of powdery mildew pathogens generally mycelium in wheat leaves overwinter Spring wheat coming back to the spring, the disease continue to produce conidia, spread with the spread of air flow spread, resulting in the onset of the field. After harvesting the wheat, the closed shell on the diseased plants will infect the autumn wheat seedlings with the conidia produced on the self-supporting wheat seedlings in the event of adequate atmospheric humidity and transmission of the disease spores to the self-grown seedlings.