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大豆灰斑病大流行年,能使大豆严重减产和降低品质。灰斑病病原菌,在降雨和有露条件下,日平均气温17℃、最低气温12℃才能产生孢子;分生孢子萌发的最适温度为21～26℃;气温在20℃以上时,病菌在大豆叶上潜育期为9～12天,在豆荚上的潜育期为20～24天。病残体是主要初侵染源。大豆结荚盛期至鼓粒中期,连继降雨有利于灰斑病流行,病粒率高。在大豆的荚期至鼓粒初期前,用多菌灵或甲基托布津防治,能控制病害流行,使病粒率降低到允许的经济损失以下。
Soybean leaf spot pandemic year, can make serious soybean yield and reduce quality. Gray leaf spot pathogen, under rainfall and exposed conditions, the average daily temperature of 17 ℃, the minimum temperature of 12 ℃ to produce spores; conidia optimum temperature of 21 ~ 26 ℃; temperatures above 20 ℃, the bacteria in the Soybean leaves on the incubation period of 9 to 12 days in the pod on the incubation period of 20 to 24 days. Infestation is the main source of initial infection. Soybean pod peak to drum grain mid-term, and even after rainfall is conducive to the gray spot epidemic, the high rate of disease. In soybean pod period to the beginning of drumming, with carbendazim or thiophanate-methyl prevention and control, can control the disease epidemic, the particle rate to reduce the allowable economic losses below.