The prevention and treatment of damping-off disease in vegetable seedlings
The cataplexy disease is commonly referred to as "falling seedlings" and "small feet", which endangers the seedlings of various vegetables, flowers, and nursery stocks, and causes death of seedlings in severe cases.
1 symptoms
Pre-emergence infection, causing cotyledon, larvae and young stem brown rot, that is, bad or bad shoots. The incidence of seedlings, mostly from the roots of the Ministry, the initial water-stained, and quickly expanded, in the cotyledons still green, wilting, the roots of the Ministry of contraction and thinning, seedlings are affixed to the ground to death, it is called "Falling disease" . When the humidity of the seedbed is high, a layer of white cotton floc is produced on the diseased area and surrounding beds. In the beginning, only a few seedlings were attacked. When the conditions were appropriate, these diseased plants were the center of rapid spread to the surrounding areas. Fields often formed a patch of wards.
2. Control methods
1 Selection area: The open nursery should be selected as a nursery with a high topography, energy irrigation, no stickiness, disease-free or mild disease, and no old seedbed soil. Protect seedlings and plant seeds. When the ground temperature is low, sow in the hot bed.
2 Suitable sowing: Under possible conditions, try to avoid the low temperature period, and at the same time, it is better to avoid the rainy season in the first month after budding.
3 bed disinfection: Bed soil disinfection is very effective in the prevention of damping-off disease. 2% metalaxyl wettable powder 9g plus 60% mancozeb wettable powder 1g per square meter seedbed, or 4~5kg sieved fine soil with 40% pentachloronitrobenzene wettable powder 9g Mix well. After watering the seedbed, 1/3 of the amount is spread over the mat bed, and 2/3 of the amount is covered. The dosage must be strictly controlled, otherwise it will have a strong inhibitory effect on the growth of seedlings. Or use 50% carbendazim powder per cubic meter of bed soil dosage 40g, or 65% zeosin zinc powder 60g, mix and cover with a film for 2 to 3 days, remove the film and wait for the smell of drug to completely evaporate before planting.
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