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梨锈病在湖北省各产梨区均普遍发生,但其为害的严重程度与早春的气候条件有密切关系。梨锈病菌在桧柏(Juniperuschinensis L.)上越冬后,在当年2月下旬至3月初即在桧柏绿色枝叶上冬孢子角全部长出。冬孢子角在桧柏上发育成熟约需25天,吸湿后胀大呈胶质团状物。冬孢子萌发产生担孢子或芽管与冬孢子角的成熟度为正相关。在梨叶上,担孢子在高湿或有水膜状态下,气温在15℃左右,只需1小时即可完成其侵染,进入寄主体内。病菌侵入叶片直到性子器阶段出现的时间长短,与田间的温度和梨叶的成熟度有显著差别,最短为6-7天,最长为14-15天或以上。在武汉情况下,从5月下旬起,锈子腔中的锈孢子开始从梨叶上飞散到桧柏上,6月上旬为盛期,7月初为末期。
Pear rust is commonly found in all pear producing areas in Hubei Province, but its severity is closely related to the climatic conditions in early spring. Rhizopus arrhizus grows over the green leaves of Juniperus chinensis (L. juniperuschinensis L.) late in February to early March that year. Winter spore horn cypress cypress on the maturity of about 25 days, moisture was swollen was glial mass. The teliospores or germs produced by teliospore germination are positively correlated with the maturity of teliospores. In pear leaves, basidiospores in the high humidity or water film conditions, the temperature at about 15 ℃, just 1 hour to complete its infection, into the host. Pathogen invaded leaves until the character stage of the length of time, and the field temperature and the maturity of pear significantly different, the shortest of 6-7 days, the longest 14-15 days or more. In the case of Wuhan, from the end of May, the rust spores in the rust cavities began to scatter from the leaves of the pear onto the cypress, beginning in early June and ending in early July.