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.

First, choose a good nursery. We should choose light-viscous loamy or sandy loam soils with good water sources and higher ground as nurseries. We should adhere to the rotation system and not continuously cultivate the same seedlings in the same nursery, and nursery soils must be disinfected beforehand. 1 Formalin disinfection. For every square meter of nursery, 50ml of formalin and 10kg of water were sprayed on the ground surface evenly, and then covered with plastic film or straw bag. The covering was opened about 10 days and the gas was volatilized. The seeds could be sown two days later. 2 carbendazim disinfection. Use 50% wettable powder, 1.5 grams per square meter. It can also be formulated in a ratio of 1:20 to spread the seedlings on seedbeds, which can effectively prevent seedling diseases. 3 pentachloronitrobenzene disinfection. For every square meter of nursery, use 45% of 75% pentachloronitrobenzene and 5 grams of zein-zinc, and then mix well with 12 kg of fine soil. Cover the plant with a cover and cover it for anthracnose, blight, and damping-off. Sclerotinia and other special effects. 4 ferrous sulfate disinfection. Use 3% of ferrous sulfate solution to treat the soil, 0.5 kg per square meter of liquid medicine, can prevent seedling blight of flowers and trees, peach, plum leaf shrinkage, and concurrent treatment of flowers caused by iron deficiency yellowing. It is best to plunge deep in winter and turn it over once in the second year.

Second, the seed disinfection. Seeds should be sowed before sowing to eliminate sick and weak seeds, soak in seeds with 0.3% to 0.5% potassium permanganate solution for 0.5 to 1 hour or soak seed in warm water at 50°C for 24 hours, and then remove the sinking seeds by 0.2. The formalin solution was soaked in a solution of 30 minutes in length and drenched for 2 hours after removal. Can also be used 0.5% ~ 1% copper sulfate solution soaked for 1 to 2 hours, then pick up the seeds rinse with water clear liquid, timely drying after sowing. Pay attention to the depth when sowing, cover soil should not be too thick, so that the seed germination seedlings.

Third, the pharmaceutical treatment. From the beginning of the seedling stage, every 5 to 75 kg of 0.5% to 1% Bordeaux mixture was sprayed on the seedbed every 7 to 10 days to form a protective film on the outside of the seedlings to prevent invasion of the bacteria. At the same time, it is necessary to put a good fertilization off, the fertilizer should be mainly applied to farmer fertilizers, supplemented by chemical fertilizers. Garbage, compost, and manure may contain pathogens and should be put on the ground before fermentation can be used. 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 the drug once every 10 to 15 days. Use 500 to 800 times 100 kg per mu, or 65% 300 to 800 times 100% spray of Dyson Zinc, or 1:100 A. 150 kilograms of arsenic-sulphate soil, or 8:2 ash lime powder mixed after appropriate application on a seedbed for treatment.

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