How to effectively prevent and cure tomato disease? Tomato squatting is a fungal disease, mainly occurs when the seedlings are cultivated in the off-season or in the nursery tray, but it can be controlled by applying pesticides!
ã€symptom】
The disease occurs only at the early stage of seedling growth. At the beginning of the disease, the base of the stem of the seedling is water-soaked, and then shrinks, causing the seedling to collapse or die. Sometimes the seed just sprouted or unearthed seedlings that are infected, rot in the soil, causing lack of seedlings, and when the seedlings die in severe cases. When the humidity is high, a white flocculent layer grows on the surface of the seedling or near the diseased seedling.
[Pathogenesis]
The pathogen is very virulent and can survive in the soil for a long time. When spring conditions are appropriate, sporangia and zoospores can be produced on the diseased seedlings, which are spread by rainwater, irrigation water, contaminated manure, agricultural implements and seeds. The seedlings are mostly infested when the temperature of the seedbed is low, and the germ growth rate is very fast when the soil temperature is 15-16 degrees Celsius. The high humidity of the seedbed soil is easy to induce the disease. After watering, the water trap or the drip of the roof is often the first to form a disease center. Insufficient light, seedlings are weak, slender, long, and resistant to disease, and are also prone to disease. Before the nutrients in the cotyledons of the seedlings are exhausted and the new roots are not solidified, the nutrient supply of the seedlings is tight and the disease resistance is the weakest. If the cold current or continuous low temperature, rainy and snowy weather occurs at this time, the seedbed insulation is not good, the photosynthesis of the seedlings is weak, and the respiration is enhanced. The consumption is increased, and the bacteria are taken advantage of, and the disease will suddenly occur.
[Control method]
Integrated prevention and control measures should be adopted to strengthen the management of seedbeds and supplemented by chemical control.
(1) Bed soil disinfection
50% seed dressing double wettable powder per square meter seedbed, or 50% carbendazim wettable powder, or 25% metalaxyl ginseng powder, or 50% Fumei double wettable powder 8~10g, mixed into 10~ 15 kilograms of dry fine soil is compounded into medicinal soil. When applying the water, first pour the bottom water. After the water has been infiltrated, take one third of the bottom of the soil. After sowing, cover the surface of the seed with the remaining two-thirds of the soil, so that the bottom cover is covered and the seeds are sandwiched. In the middle of the soil, the control effect is obvious. Keep the seedbed moist before the unearthing to avoid phytotoxicity.
(2) Seed disinfection
The seeds are sterilized by soaking seeds with warm soup or soaking seeds, so that germination should be carried out after soaking seeds, and germination should not be too long, so as not to reduce the germination ability of seeds.
(3) Strengthen management
The terrain should be chosen to be high, the groundwater level is low, the drainage is good, and the fertile land is used as a seedbed. The temperature inside the seedbed should be controlled at 20~30 degrees Celsius, and the ground temperature should be kept above 16 degrees Celsius. Pay attention to increase the ground temperature, reduce the soil moisture, and prevent the ground temperature and high humidity environment below 10 degrees Celsius. Try not to water after emergence, you must choose to water on sunny days when watering, avoid flooding. Appropriate amount of air, enhance light, and promote the healthy growth of seedlings.
(4) Chemical control
Immediately found that the diseased seedlings were removed and sprayed with 25% metalaxyl WP 800 times solution, or 64% chlorpyrifos WP 500 times solution, or 75% chlorothalonil WP 600 times solution, or 40% ethyl phosphate. Aluminum wettable powder 200 times solution, or 72.2% Plex water agent 400 times solution, or 70% mancozeb WP 500 times solution, or 15% carbendazim (earth bacteria) water agent 1000 times solution, etc. For pharmacy, use 2~3 liters of liquid medicine per square meter of seedbed, spray once every 7~10 days, and spray 2~3 times continuously.
Regarding the prevention and treatment of tomato smashing disease, Huinong.com has compiled this for everyone. The farmers who need it can come and learn!
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