Diseases and control methods of watermelon wilt

May 03, 2021

I. At the beginning of symptoms, the leaves gradually wilted from the bottom upwards, especially around noon, and returned to normal sooner or later. After a few days, the entire leaf wilted and died. The leaves are brown and generally do not fall off on the stem. Stems and roots are brownish and immersed in water. Stem lesions become thinner or the cortex is longitudinally cracked, the vascular bundle becomes brown, and amber colloids often spill over the diseased skin. In wet conditions, pink mold or white cotton-like hyphae are often produced on diseased stems.
Second, the incidence of pathogens mainly in the mycelium, sclerotia in the unripe organic fertilizer or soil overwintering, in the soil can survive 5-6 years. The germs can be spread through seeds, fertilizers, soil, and water, and compost and manure spread are the main ways. The occurrence of this disease is closely related to temperature and humidity. The temperature for pathogenic bacteria growth is 5-35°C, and soil temperature 24-30°C is the suitable temperature for germination and growth of pathogens. There are fewer sunshine, more rainy days, more rainfall and heavy soil, low-lying soil, poor drainage, poorly managed continuous cropping, poor root development of watermelon, and heavy weight; in addition, excessive nitrogen fertilizer, phosphorus and potassium fertilizers, inadequate application of maturity The organic fertilizer with bacteria, or high calcium content in the soil, the weight of the underground pests are heavy, are easy to induce watermelon blight. The disease prospered during the fruiting period, and the disease spread rapidly. In some days or more than 10 days, the disease spread throughout the whole field.
Three, 1, pharmaceutical soil treatment, can be used 50% carbendazim WP, or 65% more than a given wettable powder, or 70% soil bacteria WP, or 50% licorice WP 3-5kg/ Mu, 1.5kg mixed with fine soil or planted into the planting hole.
2. Chemical control in the field: use 98% hymexazide wettable powder 2000 times, or 40% Tecdo County float agent 1000 times, or 10% double effect water repellent agent 1500 times , Or 50% compound thiophanate-methyl WP 500 times, or 2% NR 120, 200 times, or 50% carbendazim WP 500 times, each 0.25-0.5 Kg, prevention and treatment 2-3 times according to the condition.

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