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经过10余年对栗疫病发生特点和致病性的大量调查研究，结果表明栗疫菌在板栗分布区普遍存在，是弱寄生菌，在本地只寄生那些生长十分衰弱，即将死亡的板栗树干、苗木等，但栗疫菌的寄生不是这些部位死亡的主要和直接原因，而且它所寄生的部位局部死亡后对整株栗树的影响不大，因此，栗疫病在一般倩况下并非毁灭性病害。本文首次提出了栗疫菌混合体系概念，并用此说明中国栗疫病普遍分布、危害很轻的原因。
After more than 10 years of chestnut blight characteristics and pathogenicity of a large number of investigations, the results show that chestnut prevalence in chestnut chestnut distribution, is a weak parasitic bacteria, only parasitic in the local growth is very weak, about to die chestnut trunk, seedlings However, the parasitic diseases of Yershitraria bassiana are not the main and direct cause of death in these areas, and the local parasitization of the parasites causes little effect on the whole tree chestnut trees. Therefore, the chestnut blight is not a devastating disease under normal circumstances . This paper first proposed the concept of mixed system of chestnut blight and used it to explain the widespread distribution of chestnut blight in China and the reason that it is very harmful.