Spring is coming. The temperature is gradually rising. Many pests and diseases begin to work on tomatoes. So how can I prevent tomato ulcers in the spring?
Because tomato ulcer disease is a devastating disease, it can cause 25% to 75% reduction of tomatoes in severe cases, so we should pay attention to the prevention and treatment of tomato ulcer disease.
Tomato ulcer disease prevention and treatment methods:
First, physical control of tomato ulcer disease
1. Soak the seeds in warm soup: first soak the seeds in cold water for 10 minutes, remove them and put them in 55 °C warm water for 30 minutes, stir constantly, and add hot water at any time. Soak it in cold water for 4 to 5 hours.
2, high temperature shack. Use the high temperature season of Sanxia to seal the greenhouse for 15 to 20 days.
3. Strengthen field management. In the timely growth of tomato growth and weeding, balance water and fertilizer, topdressing should control the application of nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer. Timely ventilation and light transmission is conducive to tomato growth and improve disease resistance. Avoid pruning when the dew is not dry, remove the diseased plants in time and burn them.
Second, the chemical control of tomato ulcer disease
1. Seed treatment. Soak the seeds in 5% diluted hydrochloric acid for 5 to 10 hours and soak in 0.05% sodium hypochlorite for 20 to 40 minutes.
2, seedbed disinfection. About 20 days before sowing, the bed soil was loosened, 40% of formalin was used for 20 liters per acre, 30-40 tons of water was poured onto the seedbed, and then covered with a plastic film for 5 days to remove the plastic film. The bed soil is loosened and planted again after half a month.
3. Field control. Timely spraying of Huahuawang 3 inhibits the prolongation of the main shoots, promotes flower bud differentiation, and improves the disease resistance of the plants. Spraying a fruit treasure before flowering, young fruit stage, and fruit expansion period can improve the quality of pollination and enhance the rate of fruit set in circulation. At the beginning of the disease, spraying 1:1:200 Bordeaux mixture, 72% agricultural streptomycin 4000 times solution, 77% copper hydroxide wettable powder 500 times solution or 40% DT bactericide 400 times solution, spraying interval 7 to 10 days, even spray 3 to 4 times.
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