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从不同品种、不同地点的苹果树上的轮纹斑、干腐斑及病枯枝取样，观察到苹果轮纹病菌与苹果干腐病菌的有性阶段的形态特征容易区分，无性阶段在形态特征上不易区分。经人工接种，两种病原菌在果实上引起的症状相同。经测定，两菌的生物学特性及酯酶同工酶有差异，两菌的菌丝能融合。
From the different varieties and locations of apple tree ring whetstone, dry spot and diseased branches sampling, the observed morphological characteristics of the apple ring rot fungi and apple dry rot bacteria sex stage easily distinguishable, asexual stage in the morphological characteristics Not easy to distinguish. After artificial inoculation, the two pathogens cause the same symptoms on the fruit. After the determination, the biological characteristics of two bacteria and esterase isoenzyme differences, the two strains of mycelium can be fused.