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Prevent tomato white peony disease
In addition to endangering tomatoes, white peony disease also harms peppers, eggplant, potatoes, squash, beans, kidney beans, alfalfa, ginger, and konjac. The symptoms of the disease mostly occurred at the base of the plant stem, resulting in dark lesions. After expansion, the depressions were slightly sunken. The diseased part produced white filaments of hyphae, which bunched up and spread to the upper part of the stem. The soil was damp, hyphae or even stem-based. Develop along the surface of the earth. After the victim's disease, the cortex of the stem base and roots of the diseased plant were rotted, the xylem was exposed, the leaves were yellow, and the plants wilted until the whole plant died. Control methods First, implement rotation. Severe disease onset, and the rotation of grass crops for 4 to 5 years, with the best paddy field rotation, one can be effective. Second, strengthen field management. The diseased plant was removed in a timely manner, and the diseased spot was perfused with 45% Daisen ammonium water solution 400 times 250 ml or lime powder. After the tomatoes were cleaned, the gardens were cleaned and the soil was deeply plowed. Before the preparation, the lime powder of the Mushi was 75-100 kg. Third, after the onset of the disease spread the soil around the plant nitrochlorobenzene. That is, 70% of pentachloronitrobenzene powder 0.5 kg, 15 ~ 25 kg of fine soil mix, 1 ~ 1.5 kg per acre medication, once every two weeks, even twice. Spray with 20% triadimefon EC 2000 times, 35% Thiophanate 500 times, 40% pentachloronitrobenzene suspension 400 times or 50% mixed sulfur suspension 500 times. Spray once every 7-10 days to control the condition.