Tomato bacterial wilt, wilt disease, and root knot nematode disease are diseases transmitted through the soil, called soil-borne diseases, which are the main diseases that damage the underground roots of tomatoes, causing dead roots of tomato. Tomato soil-borne diseases are serious diseases, and continuous cropping of tomatoes can occur, and it is difficult to control. Once the disease occurs, it cannot be cured and the losses are heavy. Tomato soil-borne diseases must be based on prevention and prevention of disease, in order to reduce losses.
Tomato bacterial wilt
To control tomato bacterial wilt, we must first cultivate disease-free and robust seedlings. The nursery soil should be disinfected with 80~100 times formalin aqueous solution. At the seedling stage, the roots should be immersed once and 800 times with 47% Chunlei·Wang copper WP powder for sterilization. The second is to do a good job of soil disinfection before planting, and apply 25~30 kg of quicklime per acre during land preparation to eliminate Pseudomonas aeruginosa in the soil. When planting, use copper sulfate and ammonium bicarbonate as base fertilizer, apply 8~10 kg of copper sulfate per acre, 40~50 kg of ammonium bicarbonate, stir well and mix well, then apply it in the planting hole, plant the tomato species after covering the soil. Miao, has a good effect on reducing tomato bacterial wilt.
Once again, after the seedlings are planted, timely root spraying and foliar spraying of biological bacteria or bacterial fungicides can be used to prevent 250-300 times EM bacteria aqueous solution, 800-1000 times Bacillus subtilis aqueous solution, 300-400 times. A compound biological bacteria aqueous solution, 500 times 0.5% aqueous solution of Xiaochai, 600 times of 20% thiabend copper aqueous solution, 1000 times of 46.1% copper hydroxide wettable powder aqueous solution, 1500 times of 30% copper oxychloride wettable powder aqueous solution, etc. Every 7~10 days, for 2~3 times, each time each plant is irrigated with 1.5~2kg of liquid, evenly irrigated in the soil around the roots of tomato plants, and it is better to completely penetrate the soil into the soil. Spray all the stems and leaves evenly while spraying.
In addition, it is necessary to pay attention to crops such as peanuts, soybeans, corn, rice, etc., or plant them one year later, and pay attention not to continuous cropping with solanaceous crops such as pepper and eggplant.
Tomato wilt
To control tomato wilt, we must first rotate crops with rice, corn, peanuts, soybeans and other crops, which can significantly reduce the incidence.
The second is to carry out soil disinfection and seed disinfection. Whether in the nursery or transplanting field, the soil should be watered with 600 times 80% sodium sulfonate WP solution or 800 times Bacillus subtilis wettable powder solution before and before transplantation. Disinfect. Seeds should also be soaked in 1000 times potassium permanganate solution for 5-6 hours, picked up and cleaned before planting.
Once again, it is timely to use chemical control. In the early stage of the disease, use 1000 times 30% carbaryl water agent, or 250 times 6% spring serotonin WP solution, or 500 times 72.2% sulphate water, or 500 times 0.5% sulphuric acid, or 500 times 50% carbendazim WP solution for root irrigation, every 7~10 days, for 2~3 times, each time each plant is drenched 0.5~1 kg, evenly irrigated around the roots of tomato plants In the soil, it is better to completely infiltrate the water into the soil.
Root knot nematode
Prevention of root-knot nematode disease is mainly carried out by soil treatment. When preparing the land, apply 8~10 kg of 10% calcium cyanamide granules per acre, then plow the loose land, make the calcium cyanamide fully contact with the soil, and plant it after 7~10 days. Effectively kill root-knot nematodes lurking in the soil. During the growth and development of tomato, 1500 times of 5% avermectin and 1500 times of 0.5% cucurbitine mixture were applied every 10 to 15 days, and continuous drenching was carried out for 2~3 times. ~1.5 kg, evenly applied to the soil around the roots of tomato plants, it is appropriate to completely penetrate into the soil without water, which can effectively prevent root-knot nematode damage tomato roots.
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