苹果树早期斑点落叶病是各种早期落叶病的总称,在我省主要有褐斑病、轮斑病、灰斑病和斑点病4种。上述病害均以为害叶片为主,常混和发生于易受感染的嫩叶上。前3种病害发生初期为褐色、暗褐色小斑,后来病斑扩大并呈红褐色或灰褐色,边缘呈紫褐色,病斑中央有时生小黑点或同心轮纹状。空气湿度大时,可在病斑背部显出黑褐色霉状物。叶片受害后很快变黄, Early apple blight deciduous disease is a general term for various early deciduous diseases, in our province there are brown spot disease, leaf spot disease, gray spot disease and spot disease 4 kinds. The above diseases are the main damage leaves, often mixed and occurred in susceptible young leaves. The first three diseases occurred in the early brown, dark brown spots, and later lesion enlarged and brownish red or brown, the edge was purple-brown, sometimes black spot spot or concentric circular mottle. When the air humidity is high, dark brown moldy material may appear on the back of the lesion. Leaves quickly turn yellow after victimization,