Gray mold is seriously harmful when the cowpea is cultivated in a protected area such as a greenhouse. First, the cloud plaque starts to appear 15 cm above the rhizome. The surrounding area is dark brown. The middle part of the spot is light brown to pale yellow. When dry, the epidermis is ruptured and fibrous. When wet, a layer of gray mold is formed on the lesion. The branch is ill, forming small stains, depressions, and then wilting.
Prevention and treatment methods: Due to the high infection rate of gray mold, the incubation period is longer, the bacteria are easy to produce drug resistance, and it is difficult to prevent and control. It is best to adopt comprehensive prevention and control measures combining agricultural control and chemical control. Strengthen the environmental regulation under the conditions of the shed, the water and fertilizer should be applied in a timely manner, strengthen the ventilation and dehumidification, the temperature should be appropriate, and timely spraying the new high-fat film 500 times liquid is beneficial to control the occurrence and expansion of the disease. Timely manual removal of diseased leaves and diseased pods will be carried out and completely destroyed and buried deep outside the shed. When sporadic diseased leaves appear, spray control should begin. Spray with a new high-fat film 500 times solution with a targeted fungicide , once every 5 to 7 days, and spray 2 to 3 times.
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