Tomato bacterial wilt, wilt disease, and root-knot nematode disease are diseases transmitted through the soil. They are called soil-borne diseases and are the main diseases that damage the roots of tomato, causing tomato rot and dead roots. Soil-borne disease of tomato is a disease of double crops, which can occur even when it is used as a tomato, and it is difficult to control. Once the disease occurs, it cannot be cured and the loss is heavy. Tomato soil diseases must be prevented, to prevent the 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 sterilized with 80-100 times formalin aqueous solution. The rooting period of the seedling stage should be sterilized by applying 800 times 47% of the spring bud-Wang copper wettable powder solution. The second is to do a good job of soil disinfection before planting. During the site preparation, 25 to 30 kilograms of lime are applied per acre to eliminate Pseudomonas solanacearum in the soil. When planting, use copper sulfate and ammonium bicarbonate as base fertilizer, and apply 8 to 10 kg of copper sulfate and 40 to 50 kg of ammonium bicarbonate per acre. Stir and mix well, spread in the planting hole, and then plant the tomato seed after covering the soil. Seedlings have a good effect on reducing tomato bacterial wilt.
Once again, after the seedlings are planted and survived, the roots are sprayed in time and the foliage is sprayed with biological agents or bacterial bactericides for prevention. 250-300 times more EM bacteria aqueous solution, 800-1000 times Bacillus subtilis aqueous solution, 300-400 times can be used alternately. Compound biological bacteria aqueous solution, 500 times 0.5% small Caustic soda aqueous solution, 600 times 20% copper thiazolyl solution, 1000 times 46.1% copper hydroxide wettable powder aqueous solution, 1500 times 30% copper oxychloride copper wettable powder aqueous solution, etc. Every 7 to 10 days, once for 2 or 3 times, each time, 1.5 to 2 kilograms of liquids are sprayed on each plant, and evenly poured into the soil around the roots of tomato plants. It is advisable to completely infiltrate into the soil without flowing through the soil. Spray evenly all stems and leaves when spraying.
In addition, pay attention to peanuts, soybeans, corn, rice, and other crop rotation crop after a season or a year, and pay attention not to join with pepper, eggplant and other solanaceous crops.
Tomato wilt
To control tomato wilt disease, it is first necessary to implement crop rotation with rice, corn, peanuts, soybeans and other crops, which can significantly reduce the incidence.
Followed by soil disinfection and seed disinfection. Whether it is nursery or transplanting fields, 600 times 80% ene wettable powder aqueous solution or 800 times bacillus subtilis wettable powder aqueous solution should be used to sow the soil before sowing and before transplanting. Disinfect. Seeds should also be soaked in 1000-fold potassium permanganate solution for 5-6 hours, picked up and cleaned before sowing.
Once again, it is timely to use chemical agents for prevention and treatment. In the early stage of disease, use 1000 times 30% hymexazide, or 250 times 6% aqueous solution of kasugamycin wettable powder, or 500 times 72.2% propamocarb, or 500 times 0.5% petcine alkali, or 500 times 50% carbendazim WP aqueous solution, etc. for root irrigation control, once every 7 to 10 days, continuous 2 or 3 times, each time each plant perfusion of 0.5 to 1 kg, uniform irrigation in tomato plant roots around the root In the soil, it is advisable to completely infiltrate the soil with water.
Root-knot nematode disease
The control of root-knot nematode disease mainly involves soil treatment. During soil preparation, 8 to 10 kg of 10% calcium cyanamide granules are applied per acre and then plowed to plow the land to make the calcium cyanamide fully and evenly contact with the soil. After 7 to 10 days, it can be planted again. Effectively kill root-knot nematodes that are lurking in the soil. During the growth and development of tomato, a 1500-fold 5% avermectin and 1500-fold 0.5% veratridine mixture was applied to the roots every 10 to 15 days, and they were continuously applied for 2 or 3 times, each time. ~ 1.5 kg, evenly applied in the soil around the roots of tomato plants, in order to fully penetrate the soil into the soil is not appropriate, that is, can effectively control root knot nematode damage tomato roots.
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