Cucumber fusarium wilt is an important disease on cucumber, caused by a fungus called Fusarium. The main feature of this disease is to harm the vascular bundles in the stalks. Since the supply of moisture is prevented, the whole plant is wilting and dead, especially when the weather is fine or the temperature rises quickly after continuous rain. During the seedling stage, the disease formed cataplexy, and the incidence was obvious after fruiting. In the early stage, the lower leaves become yellowish in mesh and yellow in the latter. They can spread upwards to the whole plant until they die. Sometimes the leaves of the plants do not turn yellow, they wilted at noon, and they recover sooner or later. After a few days, the whole plant withers and the leaves remain greenish. It is blue and dry.
Cutting the stem with a knife will reveal that the vascular bundle will turn yellow-brown. When the weather is wet, the diseased part will grow white or pink moldy layer.
Mycelia, chlamydospore, and sclerotia are overwintering in soil and under-ripened fertilizers, and they can also be transmitted through seeds. The bacteria invade from the root wounds and the root apical cells of the root hairs. Transplanting or soil nematodes cause the plant wounds, which is conducive to the invasion of bacteria.
Germs in the soil can survive for more than 5 years. Places with conditions should be rotated with onions, leeks, legumes, Solanaceae, cruciferous vegetables or cereal crops for 2 to 3 years. After removing the diseased plants, deep-rooting the field and pulling them, deep plowing, irrigation, and over-drawing of the old film, the soil surface temperature reaches 60°C to 70°C, 5 to 6 cm to 40°C to 50°C, and 10 to 15 days. These measures are taken. It can reduce bacteria, build water conservancy, remove accumulated water, reduce soil and air humidity, and help reduce disease.
In addition, the use of disease-resistant varieties, planting grafted seedlings can significantly reduce the disease, often in Yunnan black seed pumpkin, Jingxin anvil 5 as rootstock.
Seed disinfection can be soaked with 70% thiophanate-methyl 500-fold solution or 50% carbendazim 1000-fold solution for 40 minutes. If seed dressing is used, use a wettable powder and the dose is 0.2%~0.3% of the seed weight.
Nursery bed soil disinfection available 50% carbendazim 8 grams per square meter.
At the beginning of the disease, remove the diseased strains and irrigate the roots with 70% hymexazol (soil-contaminated) 1500 times. The interval is 5 to 7 days, and irrigation is performed 2 to 3 times.
In addition, the application of bacterial fertilizers or biocontrol bacteria, increased decomposed organic fertilizer to increase soil microbial species and the inhibition of pathogens is also a long-term effective prevention and control measures.
Cutting the stem with a knife will reveal that the vascular bundle will turn yellow-brown. When the weather is wet, the diseased part will grow white or pink moldy layer.
Mycelia, chlamydospore, and sclerotia are overwintering in soil and under-ripened fertilizers, and they can also be transmitted through seeds. The bacteria invade from the root wounds and the root apical cells of the root hairs. Transplanting or soil nematodes cause the plant wounds, which is conducive to the invasion of bacteria.
Germs in the soil can survive for more than 5 years. Places with conditions should be rotated with onions, leeks, legumes, Solanaceae, cruciferous vegetables or cereal crops for 2 to 3 years. After removing the diseased plants, deep-rooting the field and pulling them, deep plowing, irrigation, and over-drawing of the old film, the soil surface temperature reaches 60°C to 70°C, 5 to 6 cm to 40°C to 50°C, and 10 to 15 days. These measures are taken. It can reduce bacteria, build water conservancy, remove accumulated water, reduce soil and air humidity, and help reduce disease.
In addition, the use of disease-resistant varieties, planting grafted seedlings can significantly reduce the disease, often in Yunnan black seed pumpkin, Jingxin anvil 5 as rootstock.
Seed disinfection can be soaked with 70% thiophanate-methyl 500-fold solution or 50% carbendazim 1000-fold solution for 40 minutes. If seed dressing is used, use a wettable powder and the dose is 0.2%~0.3% of the seed weight.
Nursery bed soil disinfection available 50% carbendazim 8 grams per square meter.
At the beginning of the disease, remove the diseased strains and irrigate the roots with 70% hymexazol (soil-contaminated) 1500 times. The interval is 5 to 7 days, and irrigation is performed 2 to 3 times.
In addition, the application of bacterial fertilizers or biocontrol bacteria, increased decomposed organic fertilizer to increase soil microbial species and the inhibition of pathogens is also a long-term effective prevention and control measures.
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