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病菌Alternaria spp.是四川省优质苹果产区中引起苹果霉心病的主要病原菌。这些菌能以菌丝在苹果芽鳞、果台、枝梢、病痕、落叶等树体组织内和以分生孢子形式在苹果树体组织表面及苹果芽内鳞片上进行越冬。越冬病菌在开春后可成为苹果霉心病的初侵染来源。病菌侵染时期长,从苹果暴芽至果实萼筒封闭前的整个时期病菌均可侵染苹果花器组织,但以苹果暴芽、现蕾、初花、盛花等时期为主要侵入时期,最早是在暴芽期。病菌是通过芽鳞片、雌蕊、雄蕊及萼口等花器组织进入果心的。
Alternaria spp. Is the main pathogen in apple producing heart disease caused by high quality apple producing area in Sichuan Province. These bacteria can take mycelium in the apple bud scales, fruit sets, shoots, lesions, leaves and other tree tissue and in the form of conidia in the apple tree tissue surface and apple bud scales overwintering. Overwintering germs can become the source of primary infection of apple mold heart disease after the spring. Pathogen infection period is long, from apple brussels to the fruit before the occlusion of calyx tube bacteria can infect apple flower tissue, but apple buds, budding, flowering, Shenghua and other times as the main period of invasion, the earliest is In the budding period. Pathogenic bacteria through the bud scales, pistil, stamens and calyx mouth and other floral organizations into the heart.