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接种研究证实,在叶面有水滴的条件下,根腐病菌分生孢子经4小时即完成侵染活动,侵染量与水滴持续时间、接种体密度呈正相关。温度25℃左右有利于孢子萌发和菌丝生长。叶部病情发展呈S型曲线,流行速度与菌源量和气候环境有关。在小麦扬花期平均气温18℃左右,相对湿度80％以上,发病早而重,此后气候条件适宜,病害流行速度快,病害严重。根据病害流行速度,当地根腐叶枯可分为快速、中速与慢速三种流行类型。初菌源对叶期发病不仅有时间效应,还有一定的空间效应。因此,清除田间菌源以减少接种体数量,是防治根腐病的重要措施。
Inoculation studies confirmed that under the conditions of water droplets on the foliage, the conidia of the root rot pathogen completed the infection activity within 4 hours, and the infection amount was positively correlated with the duration of the water drop and the inoculum density. The temperature of 25 ℃ is conducive to spore germination and mycelial growth. Leaf disease progression was S-shaped curve, the prevalence rate and the amount of bacteria and climate-related environment. In the flowering wheat average temperature of about 18 ℃, relative humidity above 80%, the incidence of early and heavy, since the climatic conditions suitable for disease epidemic fast, serious disease. According to the prevalence of disease, the local root rot can be divided into rapid, medium and slow three popular types. The initial bacterial source on the leaf stage incidence of not only the time effect, there is a certain spatial effect. Therefore, the removal of field fungi to reduce the number of inoculum, is an important measure to control root rot.