Radish black rot commonly known as black heart, rotten heart, the disease is caused by bacteria disease. The leaves were infected and the leaves showed "V" shaped lesions on the margins of the leaves. The veins turned black, the leaf edges turned yellow, and the leaves expanded afterwards. The infected tube in the root became black and the internal tissues were dry rot. The appearance often did not show obvious symptoms, but the pith formed black dry rot and formed a hollow cavity. Many soft rots in the fields eventually became rotten.
1. Incidence conditions: suitable temperature 25-30 °C, high temperature and rain, continuous cropping or early sowing, low-lying terrain, excessive irrigation, poor drainage, little or no fertilizer, and man-made wounds and insects more than disease.
2. Control methods: Use prevention as the main method and use comprehensive prevention and control methods.
(1) Rotation of crop rotation, using formula fertilization technology. (2) Timely sowing should not be premature. (3) Selection of resistant varieties such as Fengguang Generation Radish, Qiaohong No. 1, and Shijiazhuang White Radish. (4) Seed treatment. It is soaked in warm water at 50°C for 30 minutes, or 6 hours at 60°C under dry heat, or seeded with a seed weight of 0.2% of 50% thiram wettable powder. (5) Soil treatment. Apply 40% pentachloronitrobenzene powder 750 grams per acre before sowing. The method is to take 750 grams of the fungicide, 10 liters of water, stir in 100 kilograms of fine soil and sprinkle into the hole. (6) Strengthen the management of the field, pouring water at the seedling stage, lowering the soil temperature, and raising seedlings and time. (7) Spraying 72% of agricultural streptomycin sulfate soluble powder 3000-4000 times liquid, or 47% Garethon WP 700 times or 14% Ammonia Broth Water 300 times, 7-10 Spray once a day, continuous control 3-4 times.
1. Incidence conditions: suitable temperature 25-30 °C, high temperature and rain, continuous cropping or early sowing, low-lying terrain, excessive irrigation, poor drainage, little or no fertilizer, and man-made wounds and insects more than disease.
2. Control methods: Use prevention as the main method and use comprehensive prevention and control methods.
(1) Rotation of crop rotation, using formula fertilization technology. (2) Timely sowing should not be premature. (3) Selection of resistant varieties such as Fengguang Generation Radish, Qiaohong No. 1, and Shijiazhuang White Radish. (4) Seed treatment. It is soaked in warm water at 50°C for 30 minutes, or 6 hours at 60°C under dry heat, or seeded with a seed weight of 0.2% of 50% thiram wettable powder. (5) Soil treatment. Apply 40% pentachloronitrobenzene powder 750 grams per acre before sowing. The method is to take 750 grams of the fungicide, 10 liters of water, stir in 100 kilograms of fine soil and sprinkle into the hole. (6) Strengthen the management of the field, pouring water at the seedling stage, lowering the soil temperature, and raising seedlings and time. (7) Spraying 72% of agricultural streptomycin sulfate soluble powder 3000-4000 times liquid, or 47% Garethon WP 700 times or 14% Ammonia Broth Water 300 times, 7-10 Spray once a day, continuous control 3-4 times.
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