This disease is also called melon leaf spot, melon brown spot, which mainly damages the leaves and also harms stems and fruits. In the initial stage of disease, greenish yellow dots first appeared on the leaves, and then gradually expanded into round to oval brown spots. The center was greyish white, with dark brown to purple-brown edges, slightly bulging, and with oily outer edges. The weather is clear and it is easy to get sick when the temperature is high. The number of spots on the diseased leaves is greater, and in severe cases, leaf curling and death may occur. Generally occurs in the upper and middle leaves. Stem vines, mostly in the stem vines produce diamond-shaped or oval depression brown spots. Onset of fruit, round brownish brown spots appear on the surface of the fruit, rising slightly deeper into the pulp and causing decay. The disease mainly relies on attaching to the diseased body or seed coat for overwintering, and the conidia are produced in the following year. The disease spreads through wind and rain and is re-infected several times. The occurrence of melon fields with more nitrogen fertilizers, thin soil ridges, and weak plant disease resistance is heavier. Can use spray spray to eliminate governance: 1.60% oxazoline Synthetic water dispersible granules 750 times. 2.80% of pyraclostrobin WP 750 times. 3.20% Yezizole wettable powder 750 times + 75% chlorothalonil wettable powder 450 times. 4.50% iprodione suspension 1000 times solution + 50% thiazole zinc WP 750 times.
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