The recent high temperature and rain, radish easy to black heart, rotten heart disease. 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.
First, the onset conditions: appropriate temperature 25 °C ~ 30 °C, high temperature, rainy, continuous crop or early sowing, low-lying, excessive irrigation, poor drainage, less or no fertilizer, and man-made wounds and insects often heavy.
Second, the prevention and control methods: the main prevention, comprehensive prevention and control methods.
1. Rotate the crop and use formula fertilization. 2, timely sowing, not too early. 3, the selection of disease-resistant varieties, such as Fengguang generation radish, Qiaohong 1, Shijiazhuang white radish. 4, seed treatment. Soaking in warm water at 50°C for 30 minutes, or 6 hours at 60°C for dry heat, or dressing 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 field management, seedling water pouring, reduce soil temperature, and time seedlings, Dingmiao. 7. At the beginning of onset, spray 72% of agricultural streptomycin sulfate soluble powder 3000-4000 times, or 47% Garethon WP 700 times or 14% colubrum ammonia water 300 times, every 7-10 Spray once a day, continuous control 3 to 4 times.
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