Watermelon is a must-have fruit for summer heat. In the process of planting watermelon, the occurrence of root rot will lead to severe reduction of watermelon production and even rejection. So what should be done when watermelon planting encounters root rot? This article will introduce the method of treating watermelon root rot. 1. Watermelon root rot symptoms The disease is mainly harmful to the roots of the melon and the stem, and rarely damages the stems. After colonization, the disease can begin. It is initially water-stained, and then it is light brown to dark brown rot. The diseased part does not contract. The vascular bundle turns brown, but does not expand upward. It can be distinguished from blight disease. It is getting worse, the tissue is broken, leaving only the filamentary vascular bundle. At the beginning of the victim stem, the vine tip was slightly curled up and grows slowly. After that, the whole plant leaves wilted at noon, and recovered sooner or later, and gradually died. 2. Watermelon root rot pathogen After isolation and culture, it was identified as Fusariumsolani (Mart.) App.etWollenw, which is called Fusarium solani, belonging to the genus Hymenoptera. 3. The pathogenesis of watermelon root rot According to field investigations, the watermelons in the protected areas began to occur in mid-February in February. The mid-to-late period in March was the peak of the disease, and the diseased plant rate was 35% to 60%. In severe cases, all the watermelons in the greenhouse were infected, and the disease was re-emerged after repeated breeding, resulting in no harvest. The exposed watermelon is the initial period from late April to early May, and the mid-to-late May is the peak period. The disease rate is as high as 80%. At the same time, in the investigation, it was also found that the watermelon root-knot nematode was a serious melon field, and the watermelon root rot was also harmful. Sunny days, less rain, slow development of diseases, light damage; after rainy days or watering, the disease develops rapidly and is harmful; the incidence of continuous cropping, clay, saline-alkali and low-lying areas is heavier. 4. Watermelon root rot prevention and control measures From the large-area control effect, in the early stage of the disease, use methyl thiophanate 50% wettable powder 600 times solution, or 50% carbendazim WP 500 times solution, or 40% polysulfide suspension 600 times solution, or 77 % can kill 500 times of wettable powder, or 14% of ketamine aqueous solution, which has good control effect. When the incidence is serious, the effect is very good by using 50% phorhin WP 1000 times solution and 70% mancozeb WP 1000 times solution.
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