How to distinguish between potato early blight and late blight? Potato early blight and late blight are diseases caused by fungi. Mainly infested with leaves and potato tubers, late epidemic cases can also harm stems.
The differences are as follows:
(1) On the leaf: Early blight lesions are dark brown, round or nearly round, with concentric wheel pattern. When the humidity is high, black mold layer is formed on the lesion. When the disease is serious, the leaves are dry and fall off; the late blight disease leaves first The tip of the leaf tip is water-soaked with greenish brown spots. The area around the lesion has a light green halo. When the humidity is large, it spreads rapidly and is brown. It produces a thin layer of white mold. The dry lesions become brown and dry and crack, which is different from early. Epidemic disease.
(2) On the stem: There are few lesions or no lesions on the stem of the early plague, but in addition to the infection on the stem, the late blight can also be infected on the petiole, showing brown streaks. Zheng shrinks, eventually the whole plant black rot, the whole field is a bit of coke, giving off a smell of corruption.
(3) on the tuber: early blight on the tuber produces brown round or nearly round slightly depressed lesions, with distinct edges and light brown sponge-like dry rot under the skin; and late blight on the tuber with primary brown or purple brown disease Spot, the subcutaneous pulp of the diseased part is brown, and it is enlarged or rotted around, which is different from early blight.
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