Green flowers, how to prevent and cure the disease of flowers and trees at seedling stage

The disease of flower W in seedling stage mainly occurred in the seedling stage of flower W plant. Annual herbaceous flowers often cause a sudden decline in seedlings; seedlings of perennial flowers and W-flowers and flower stems cause wrestling before stem quality. The disease has a variety of parasitic diseases.

Dangerous symptoms

Seeds or branches can be infected and rot when they are not excavated. In the seedling stage, water stains appeared on the stem surface below the surface or under the soil surface. The lesion is yellowish brown and contracted, and can be extended to the upper and lower parts of the plant and is linear. The disease developed rapidly, the tissue disintegrated and the seedlings withered, but the leaves were green in a short time. If the environment is moist, the pathogen and its nearby soil surface will produce a white cotton-like dense mycelium layer.

Preventive and therapeutic measures

1. Measures to improve seedling breeding: select high terrain, dry, well-drained places as seedbeds; apply completely decomposed fertilizers or use high-quality cultivated soil; control the amount of irrigation at seedling stage and the soil should not be too wet; sow in time, the effect of impervious humidity of seedlings should be affected; flowers should be cut and propagated, and slices should be slightly dry to promote wound healing; sowing should not be too dense; seedlings should keep the seedbed well ventilated. Diseased buds should avoid continuous cropping or soil disinfection and replanting. Implement excellent seedling planting, cultivate strong seedlings and enhance disease resistance.

two。 Soil and substrate disinfection and fumigation: 2 to 3 weeks before sowing or cutting, sterilized with 40% stagnant formalin, 40 to 50 ml seedbed per square meter, 50 (wet water) to 200 (dry soil) time), evenly sprayed or dumped, the soil surface was immediately covered with plastic film or woven bag and removed after 5 to 7 days. It is better to relax the topsoil to promote the volatilization of gas. After 1 to 2 weeks, the smell of the drug came out completely. You can play with it. Matrix disinfection: every cubic meter with 300 to 500 ml formalin, diluted with water, evenly smeared, stacked, covered with film, after 2 days and one night to remove the film, smear soil and gas. Application of soil: apply one of the following drugs to the bed or substrate surface before sowing, 65% dikesonezine 40% seedlings (resistance to Fusarium wilt requires the same amount of thiram), 50% dry, 65% immortaline zinc, 65% carbendazim, 75% chlorothalonil, 40% ethyl aluminum, 40% mixed seedlings, pentachloronitrobenzene plus thiram or mixed seedlings, 25% frost plus 70% mancozeb 9:12, use 8 to 10 grams per square meter of the above agent Add 3 to 5 kilograms of fine dry soil, mix with soil or topsoil, or sow seeds before sowing, sow 2 / 3 of the soil and cover the seeds. Drugs can also be mixed into the matrix nutrient soil, 40-60 grams of the above reagents are added to each cubic meter of matrix, and the mixture is mixed and stacked for 1-2 days.

3. Chemical control in the early stage of the disease, spray fungicides can effectively control the epidemic situation. Commonly used fungicides include 50% carbendazim wettable powder 500 times liquid, 25% metalaxyl wettable powder 800 times liquid, 40% ethyl aluminum wettable powder 200 times 400 times liquid, or 25% romycin 600 times liquid spray, 75% chlorothalonil wettable powder 600 times liquid and so on.

Time: 2019-05-11 Click: