Difference:1, potato early blight is a fungal disease, caused by the fungi known as eggplant streptospore in the hemiptera subphylum; potato late blight is also a fungal disease, caused by the flagellates in the subphylum known as pathogenic mildew fungi.

2, early blight mainly harm leaves, stems. Late blight mainly occurs on leaves, petioles, stems and tubers.

3, the symptoms are different: early blight leaf damage produced round or nearly round black-brown spots, spots with concentric whorls, the size of 3?4 mm, high humidity, black mold on the spots, the onset of severe leaf drying and shedding, resulting in field leaf scorching. Tubers infected, the spot dark brown or dark brown, round or nearly round, slightly sunken part of the disease, the edge is clear, the skin is light brown spongy dry rot. Late blight on leaves often occurs at the tip and edge of the leaf, the beginning of a watery spot, when the weather is wet quickly expand, the spot and the healthy part of the no obvious boundaries, in the edge of the spot there is a white sparse mold wheel, the back of the leaf is more obvious. In severe cases, the spots extend to the main veins or petioles, causing the leaves to wilt and droop, and finally the whole plant becomes charred black and wet-rotted. When the weather is dry, the spots dry up to brown and do not produce mold wheels.

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