苹果黑星病是欧美苹果上的主要病害,1955年最初在北海道札幌市郊外的苹果园发现。如何传人日本,尚无确切证据。估计是供给当时驻军的进口苹果中混有黑星病果,食后的残渣随肥料施入果园感染所致。到了1965年,该病扩大到北海道全域。苗木贩运是传病的主要原因。1968年在本州岩手县园艺试验场发现该病,随后又在青森县、秋田县 Apple scab is a major disease on apples from Europe and the United States. It was first discovered in apple orchards in the suburbs of Sapporo in Hokkaido in 1955. How to pass to Japan, there is no conclusive evidence. It is estimated that the imported apples supplied to the garrison at that time were mixed with black star fruit, and the residue after the meal was applied to orchards with the fertilizer. By 1965, the disease expanded to Hokkaido. Seedling trafficking is the main reason for the disease. The disease was discovered at the Iwate Prefecture Horticultural Experiment Center in 1968 and was later found in Aomori, Akita