Spinach downy mildew usually starts from the lower leaves of plants and gradually develops upwards. Lesions develop into yellow-brown patches in the middle and late stages. In severe cases, the lesions are connected to each other and the color is yellowish to brown, leaving the entire diseased plant blade yellow and dead. Control methods: 1. Timely removal of diseased seedlings, promotion of rotation cultivation with other vegetables, strengthening of management, reasonable water control, timely air release and dehumidification, and sunny days can be used to create ecological conditions that are not conducive to the occurrence of germs through sterilization methods at high temperature. 2. Using chemical treatment, seeds are sowed with 2.5% Coloplast and sprayed at the beginning of the disease. (1) 72% Ke Lu wettable powder 1000 times liquid, (2) 50% Anke manganese wettable powder 1000 Doubling liquid, (3) 53% Jin Lei Duomi WP 800 times, alternating use.
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