(1) Symptoms: Phytophthora can cause harm to all growth periods and different parts of the plant, but it is the heaviest victim to adult plants. When the seedlings were injured, the base of the stem was water-stained, and the posterior contracture was dark brown. The base leaves first wilted, and soon the seedlings died of blue and dry. In the adult, the stem base produces dark green water-stained lesions, and the disease department contracts. The disease department was rotten when it was wet; when dry it was greyish brown and dry. The above-ground part of the diseased plant rapidly died of the dead. The leaves are injured and spread from the leaf margin inwards to form large yellow-brown lesions, and the leaves are easily broken. The melon suffers from dark green near-circular water-stained lesions. The lesion quickly spreads in the wet, and the diseased part is rotted and rotted. In the disease minister sparse white mold.
(2) Control methods: 1 Agricultural preventive measures, such as selection of well-drained, sandy loam with high fertility, and large fields not grown in 5 years; high ridge cultivation, reasonable irrigation, pouring well water as much as possible, and strictly prohibiting string irrigation, Flood irrigation and watering at high temperatures during the day; film cultivation, fine management; selection of disease-resistant varieties. 2 chemical control. Found that the central diseased plants, that can be used to control the combination of irrigation and spraying methods. Commonly-used pesticides include 40% EB aluminum wettable powder 300 times or 75% EB aluminum wettable powder 600 times, 70% enemy powder 100 times, 50% DM WP 500 times, 25% Metalaxyl WP 800 times, 50% Sulfonyl WP 1000 times.
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