1979～1986年的试验研究表明,河北省梨黑星病越冬的主要初侵染源是“病芽梢”。盛花期后病芽梢产生大量分生孢子,侵染叶、果,其被害程度与病芽梢的多少呈正相关。经人工接种,明确病菌侵入梨芽的时期是在6～9月份,重点是8月份,此时梨叶、果发病程度与翌年病芽梢发生多少也呈正相关。提出病芽梢发生期是药剂防治的关键时期。 Experimental studies from 1979 to 1986 showed that the primary source of infection of pear scab overwintering in Hebei Province was “shoots shoots.” After flowering buds shoots produce a large number of conidia, infection of leaves, fruits, the degree of damage and the number of buds were positively correlated. The artificial inoculation, a clear pathogen invasion of pear buds in the period from June to September, the focus is August, when the pear leaf, fruit disease incidence and next year how much is also a positive correlation between the occurrence of buds. Put forward the occurrence of the bud is the key period of drug prevention and treatment.