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1980～1989年利用室内和室外试验相结合的方法研究了黑龙江省密山虎林地区大豆灰斑病的再侵染条件,初步结果表明大豆叶片病斑在温度24℃左右,日保湿润16h以上最利于病菌产孢。病菌孢子在温度22℃条件下生命力6～11d,高温环境不利于病菌孢子存活。大豆成林期叶部发病程度取决于日平均气温高于18℃、日最低温度高于12℃及日平均相对湿度大于80%或有降雨量多于0.1mm的气象条件出现的日数。大豆籽粒发病率与大豆开花后20～35d之间的降雨量、雨日、平均相对温度、日平均湿度≥20℃且日平均相对湿度≥85%的天数呈显著正相关。
From 1980 to 1989, the re-infecting conditions of soybean gray leaf spot in Mishan Hulin area in Heilongjiang province were studied by a combination of indoor and outdoor experiments. The preliminary results showed that the leaf spot of soybean leaves re-infiltrated at a temperature of about 24 ℃, Most conducive to bacteria sporulation. Bacteria spores in the temperature of 22 ℃ under the conditions of vitality 6 ~ 11d, high temperature environment is not conducive to the survival of bacteria spores. The incidence of soybean leaves in the forest is dependent on the number of days when the daily mean temperature is higher than 18 ℃, the daily minimum temperature is higher than 12 ℃, the daily average relative humidity is more than 80% or the rainfall is more than 0.1mm. The incidence of soybean grains was significantly and positively correlated with the rainfall, rainfall days, average relative temperature, daily average humidity ≥20 ℃ and daily average relative humidity ≥85% between 20 and 35 days after flowering.