Pathogens called the Fusarium bean specialization type, is a fungus fungus. Mycelium is colorless and separated. There are two types of conidia. Large-sized conidiophores sickle-shaped, straight or slightly curved, with 3 to 6 septa, mostly 3 to 4 apical cells slightly pointed, pedicellate or absent; small conidia colorless, with 1 separation or without, Oval or oblong, size 5 ~ 12.51.5 ~ 3.5 micron; chlamydospore sub-round and oval two, the former diameter of 8-12 microns, the size of the oval 7 ~ 105 ~ 7. Five micrometers, the chlamydospores are single-stranded or stratified in the middle of the hyphae.
Transmission pathways and disease conditions occur in the soil as mycelium and chlamydospore with the diseased body in the soil, pathogens invade from the wound, spread in the field by irrigation water, insects or rain splash. High temperature and humidity conditions are prone to onset. Planting continuous cropping, soil viscous weight, and root dysplasia are susceptible to disease. There is some difference in disease resistance among varieties.
Prevention and control methods (1) Selection of varieties resistant to wilt disease according to local conditions. (2) Serious flooding should be carried out for 2 to 3 years. Inconvenient crop rotation can be used to thermally disinfect the soil with plastic film, and compost or fully decomposed organic fertilizers fermented with enzymes can be used to reduce the amount of chemical fertilizers. (4) Strengthen inspections to remove diseased plants in a timely manner, shower 50% thiophanate-methyl sulfate sulfuric acid 800 times or 25% carbendazim WP 500 times, 10% mixed amino acid copper water 300 times, 12% copper rosinate emulsifiable concentrate 500 times liquid, spraying a good liquid 0.3-0.5kg per hole, once every 7 days, a total of 2 or 3 times. Stop spraying before harvesting for 3 days.
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