The disease of watermelon is also called Phytophthora, commonly known as "dead bug". It is a kind of soil fax fungus disease. It can occur in watermelon seedlings and adult plants, especially in the late stage of watermelon growth and high temperature and rainy conditions. The onset is rapid and severe; If the rainy season comes early, the rainfall is long, and the rainfall is heavy, the onset is early, the condition is heavy, and the loss is large. The peak incidence in the field is often immediately after the peak rainfall. Leaf disease, resulting in dark green water spots round or irregular shaped lesions, rotten when the humidity is high or burn like boiling water, dry spots light brown, easy to break. The basal part of the vine spreads, and a spindle-shaped water-immersed dark green spot appears, enveloping the stem and rot, and all the diseased parts are dead. Onset of fruit, the formation of dark green round water-immersed depression spots, rapid expansion after the whole fruit, resulting in fruit rot, the smell of silage, dense white mycelium diseased surface.
Control methods: From the initial stage of disease development, use 50% of methicone wettable powder 700 to 800 times, 72.2% of Precedrine 800 times, 64% of anti-mite WP 500 times or 58% of metalaxyl Manganese zinc wettable powder 500 times, spray every 7 to 10 days, even spray 3 to 4 times. If necessary, the above-mentioned liquid can also be used to irrigate the roots, and 0.4 to 0.5 liters per plant. If the spray and irrigation are performed at the same time, the effect is better.
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