苹果斑点落叶病是由Alternaria mali Roberts的强毒菌株侵染而造成的新病害,除为害叶片外,尚能为害枝条和果实。 一、发生规律 该病以其菌丝体和分生孢子在病落叶中越冬,翌年春产生分生孢子,借气流传播,进行初次侵染。当苹果展叶后,遇雨或叶面结露时,分生孢子便可萌发侵入,该病潜育期极短,一般只 Apple spotted leaves disease is a new disease caused by the virulent strains of Alternaria mali Roberts, which can damage branches and fruits except for leaves. First, the law Occurrence of the disease with its mycelium and conidia in the diseased leaves in winter, the next spring produce conidia, by air flow, the initial infection. When the apple leaves, in case of rain or foliar condensation, conidia can germinate invasion, the disease incubation period is extremely short, generally only