Fusarium wilt is a watermelon Fusarium oxysporum f. sp. After planting, the lower leaves withered, and then the entire leaves withered. The base of the stem is curled up, brown spots appear, and sometimes the diseased part flows out of amber gums, the roots are browned and rot with the stems. The common pathogenic bacteria winter in the soil and invade from the cell gap near the top of the root, thereby blocking the catheter and damaging the root tissue. The common pathogens live in the soil for several years and can proliferate around the weeds. When the local temperature reaches above 20°C, it can cause diseases in greenhouses and small arches. After continuous rainfall, when the weather is clear and the temperature rises rapidly, the onset is rapid.
Control methods:
1. Agricultural measures: Avoid continuous cropping and improve drainage. Acidic soil should be applied lime more. The stems and leaves of the onset of the plot should be burned together with the straw used for covering. Grafting and cultivation of gourd and pumpkin can completely prevent blight.
2. Chemical control: In the early stage of disease, 50% carbendazim 500 times or 50% thiophanate-methyl 400 times or 25.9% anti-fugining 500 times or in a concentration of 100 ml per 100 ml of guanacin 120 solution or 0.3% copper sulphate solution Or 50% of thiram 500 times plus 96% of copper sulfate 1000 times or 5% of bacteriophage clear 400 times or 119% of double effect ling 200-300 times or 800-1500 times of potassium permanganate or 60% of suidiphospho-aluminum 350 Times or 20% methyl-precipitation EC 1000 times and other agents IRO. In short, all diseases must be prevented and no disease prevention should be done. Otherwise, it will be too late for the disease to stop.
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