The control of watermelon wilt
Fusarium wilt is commonly referred to as "death disease" and is a soil-borne fungal disease. The germs infested young shoots and seedlings causing rot and slow growth and wilting. In the adult stage, the watermelon grows day by day. The diseased plant grows gradually from bottom to top. It begins to recover in the morning and in the evening. It resembles the symptoms of water shortage and the whole plant dies after a few days. The diseased stems were checked and the base was shrunk. It was rusty brown water stains. When the air is wet, water-stained streak may appear on the diseased stem, and a pink mold layer may be formed on the surface. Another fungal disease occurring in the same period and causing death is called "wild blight." Distinguish between these two diseases is to use a blade to cut the base of the stem obliquely, the vascular bundle browning is the wilt disease, and the other wilt disease only harms the stem base. The blight disease can also harm the leaves and melon, forming a round or irregular shape on the leaves. Dark brown lesions, small black spots on the lesions; wilting or withered blight is not the whole plant. Medical Disposable Mask, Cup N95 Respirator, Antivirus N95 Respirator, Surgical Face Mask GUANGZHOU HTD INTERNATIONAL , https://www.maskhtd.com
Fusarium wilt pathogens can survive in the soil for many years. Continuously growing melons will cause the bacteria to accumulate and the damage will increase. Some local pipe wilt disease called "double blinding disease" is the reason. Then, crop rotation and cultivation of disease-resistant varieties will become the preferred control measures. It is best to work with wheat and corn for 6 to 7 years. In addition, the use of pumpkin or gourd as rootstock grafted watermelon seedlings can effectively control blight. Mild-disease fields also have certain disease-preventive effects in the removal of diseased bodies and the removal of diseased plants.
Chemical control emphasizes early prevention and early treatment, and use of hymexazol (Teobacillus), benomyl (benzate) or carbendazim, thiophanate-methyl and other agents on the basis of correct diagnosis and prediction. Can be used 50% carbendazim WP 1000 times liquid soaking 30 to 40 minutes, or soaked with 10% bleaching powder for 10 minutes, after removal with 0.1% to 0.15% of 50% benomyl wettable powder dressing. 70% hymexazne wettable powder lg/m2 can be mixed with 1 kg of fine sand. After sowing, evenly spread into the nursery bed for cover soil, or use 70% hymexazide wettable powder 1000 times liquid to spray seedbed. In the early onset of the field or when a sporadic diseased plant was detected, the roots were irrigated with a 600-fold solution of 3.2% methylthiodithiocarbamate and 50% benomyl wettable powder 1000-fold, and 0.4-0.5 liters of liquid per plant.