Control methods of Fusarium wilt

Fusarium wilt, also known as blight, caused by fungi or bacteria plant disease, sudden onset, symptoms include severe spots, wilting or leaf, flower, fruit, stem or whole plant death, rapid growth of young tissues are often attacked, most important economic crops are infected by one or more diseases, let's take a look at the control methods of blight!

Symptoms of blight

Young plants grow poorly after infection, leaves of diseased seedlings become shallow, no obvious symptoms, serious petiole fold down near leaf sheath, dying and drying, and then stem withered and died. Finally, the diseased root browned and rotted, the stem base split longitudinally, and the vascular bundle browned when dissected. The old leaves of adult plants are yellowed, accompanied by chlorosis of the outer leaf sheath vascular bundles. Yellowing starts from leaf margin, then gradually extends toward midrib, some leaves are yellowed completely. Pink mould layer was produced on the surface of diseased part, namely conidia and conidia. Finally, the diseased root browned and rotted, the stem base split longitudinally, and the vascular bundle browned when dissected.

Pathogenesis of Fusarium wilt

The pathogen overwinters mainly in undecomposed organic fertilizer or soil as hypha, chlamydospore or sclerotium, and can survive in soil for 6~10 years. The pathogen can be transmitted through seeds, fertilizer, soil and watering, and compost and compost are the main transmission routes. The occurrence of this disease is closely related to temperature and humidity. The growth temperature of the pathogen is 5~35℃, and the suitable temperature for germination and growth of the pathogen is 24~30℃. The disease is a soil-borne disease, and the degree of occurrence depends on the amount of infectious bacteria in the soil. General crop planting, underground pests, extensive management, or heavy soil viscosity, moisture and other diseases occur seriously.

Preventive measures against blight

1, irrigation prevention: 41% polyastine·pyrimethamine diluted by 600~800 times, before or after sowing and planting before 10 a.m. or after 5 p.m. seedbed irrigation.

2. Root irrigation prevention: At the time of colonization or after colonization and before the expected disease frequent period, 41% polyastine·pyrimethanil was diluted by 800 times to irrigate the roots, and the drug was administered once every 7 days. The number of drugs depends on the disease.

Treatment of blight

1, foliar spraying: 41% polyastine·pyrimethanil 600~800 times diluted evenly sprayed, serious disease, can appropriately increase the dosage.

2. Root irrigation treatment: dilute the diseased plants 600~800 times for root irrigation. If the pathogenic bacteria harm the aboveground parts at the same time, spray the aboveground parts at the same time as root irrigation, and apply the medicine once every 7 days.