Seedling infestation disease prevention

Common diseases of seedling infestation include damping-off disease, blight, leaf spot, and anthrax. These diseases often cause a large number of deaths of seedlings in the short term, and cause great losses to the farmers. Several comprehensive prevention and control measures are introduced.

The nursery should choose a light and sticky loam soil or sandy loam with a good water source and a relatively high topography as a nursery. Stick to the rotation system, do not continuously cultivate the same seedlings in the same nursery, and the soil must be disinfected in advance. 1 Formalin disinfection. Nursery per square meter with 50 ml of formalin and 10 kg of water is evenly sprayed on the ground surface, and then covered with plastic film or straw bag. The covering is opened about 10 days after boring and the gas is volatilized. The seeds can be sown two days later. 2 carbendazim disinfection. Use 50% wettable powder, 1.5 grams per square meter. 3 pentachloronitrobenzene disinfection. For each square meter of nursery, use 45% of 75% pentachloronitrobenzene and 5 grams of mancoze zinc. Mix and mix with 12 kilograms of fine soil. Cover the plant with a cover and cover the anthracnose, blight, and dampening. Sclerotinia and other special effects. 4 ferrous sulfate disinfection. Treatment of soil with 3% ferrous sulfate solution, 0.5 kg per square meter of liquid, can prevent seedling blight of flowers and trees, peach, plum leaf shriveled, and flower iron deficiency caused by yellowing disease.

Seeds should be carefully selected before seed sowing, disease and weak seeds should be eliminated, soaked with 0.3% to 0.5% potassium permanganate solution for 0.5 to 1 hour or soaked in warm water at 50°C for 24 hours, and then the sinking seeds can be removed. Soak the seeds in 0.2% formalin for 30 minutes and remove them for 2 hours. Can also be used 0.5% to 1% copper sulfate solution soaked for 1 to 2 hours, then pick up the seeds rinse with water clear liquid, timely drying after sowing.

The pharmacological treatment starts from the seedling stage, spraying seedlings of 0.5 to 1% Bordeaux mixture 50 to 75 kg every 7 to 10 days per acre seedlings to form a protective film on the outside of the seedlings to prevent the invasion of germs. After the onset of disease, remove the diseased seedlings in time and remove the lime powder around the diseased seed hole to prevent the spread. And apply once every 10 to 15 days, with a 500 to 800 times the enemy, 100 grams per mu, or 65% of the 300-800 times Daisen zinc spray 1000 kilograms of lime can also be used Mix the powder and spread it on a seedbed for treatment.

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