Symptoms: mainly damage the leaves. At the beginning of the leaf or leaf margin irregular brown spots, the edge of dark brown, wide, the central gray-brown to grayish white, late disease is a small black spots, that is, the pathogen of the conidia.

Disease characteristics: The disease is a disease caused by a fungus. Pathogens are spotted red yeasts.

The pathogenic bacteria in the diseased part or with the diseased leaves overwintered on the surface of the earth, and when the conditions were appropriate in the second year, they spread by wind and rain, causing initial infection and reinfestation. Autumn is more prone to disease when it is rainy, low-lying terrain or long-term moisture retention time.

Control methods:

(1) Horticultural control: The garden is cleared timely in the late fall and early winter, and the diseased leaves are concentrated and burned; with decomposed organic fertilizer, the disease resistance is enhanced.

(2) Chemical control: spraying at the beginning of the disease, 75% chlorothalonil wettable powder 600 times, 50% 100% sulphur (chlorothalonil plus sulfur) suspension agent 500 times, spray for about 10 days 1 Second, control 2 to 3 times.

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