Wang Qinfu, Qujia Village, Longchi Township, Pucheng County, Shaanxi Province, inquired to inquire: He planted greenhouse peppers in the early winter each year, which can cause frequent crop blight at the seedling stage, leaving him helpless and not knowing what to do? The author interviewed the director of China Pepper Research Association and Zhao Zun, vice president of the Horticulture College of Northwest Agriculture and Forestry University.
Dean Zhao told the author that Blight disease can be found at the seedling stage and the adult plant stage, but it usually occurs at the seedling stage, especially during the late seedling stage.
Symptoms: The pathogens are mainly harmful to the stem base of the seedlings. At the onset of the disease, oval-shaped dark brown spots appear on the base of the pepper seedlings and stems. When the disease began, the seedlings wilted during the day and returned to normal sooner or later. With continued development, the lesion gradually expands and swells, circling around the stem for a week, causing contracture, which results in the death of the seedlings. However, the seedlings do not immediately fall down and remain in an upright state. Therefore, it is called “wild blight†and is different from damping-off disease. feature. When the humidity is high, the spidery sparse light brown mold layer can be seen in the diseased part, and there is no obvious white mold, which can be treated differently from damping-off disease.
Prevention:
1. Seed treatment. Use "seed dressing double" to sterilize seeds.
2. Bed soil disinfection. Bed soil disinfection should pay attention to, can not be used alone quintozene nitrobenzene, must be mixed with 50% of the same amount of Fumei double wettable powder, 8 grams per square meter -10 grams, mixed fine soil 10-15 kg, 1/3 Spread the bottom of the bed and cover the seeds after 2/3 sowing.
3. To strengthen seedbed management and reasonable ventilation. Regulate seedbed management, reduce seedbed humidity, and prevent seedbed temperature from rising to low.
4. Chemical control. At the beginning of the disease, 20% of methyl-rhodium-phoshophos EC was sprayed with 1,200 times, 36% of methylthiophos-phosphate 500-fold, 15% of Hymexazol, 450-fold, and 5% of Jinggangmycin. Times of liquid and so on. If damping-off and damping-off occur together, use 72.2% Precloxone 800 times with 50% thiram WP 600 times. Spray the stem base and around the ground, spray once every 7-8 days, 2-3 times in succession.
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