Radish incidence is small, and the onset is late, the appearance of symptoms is not obvious, and some often found on the market only a lot of no commercial sex. In general, vegetable farmers often ignore the prevention and control of diseases, resulting in reduced production and income. Black rot 1. Symptoms are mainly caused by damage to leaves and roots. The leaves were infected and the leaf margins showed a "V"-shaped lesion. The veins of the leaves became dark, the leaf margins turned yellow, and the leaves expanded afterwards. The infected vessels in the roots became black and the internal tissues were dry and rot. The appearance often did not show obvious symptoms, but the pith showed black dry rot and formed empty holes. Many soft rots in the fields eventually became rotten. 2. The comprehensive prevention technology turns down and sows at the right time. Seeds soaked in warm water at 50°C for 30 minutes, or 60°C for dry heat sterilization for 6 hours, or seed dressing at 0.4% 50% citrate copper wettable powder, rinsed with water, dried and sown, or used for seeding A weight of 0.2% of 50% omeprazole WP 750 g, 10 kg water, stir in 100 kg of fine soil and then scattered into the hole. During the seedling stage, the water is poured hard, the soil temperature is lowered, and the seedlings and seedlings are planted. At the beginning of the disease, spray 72% of agricultural streptomycin sulfate soluble powder 3000～4000 times solution, or 14% colubrum ammonia copper water solution 300 times, or Fengling 200 times solution, agricultural anti-seven one eighty-eighty times, every 7～10 Once a day, even defense 3 to 4 times. Soft rot 1. Symptoms identify mainly roots, petioles, or leaves. The infection of the roots often starts at the root tip and is initially brownish in water-like soft rot. Afterwards, it gradually spreads upwards, causing the soft rot of the heart to rot into a ball. Leaf petiole or leaves infected, first showed soft rot like water. Stop expanding after the drought, clustering new leaves. The boundary of the diseased health department is distinct, and brown sap often oozes out, causing the radish to turn brown and soft rot. Planting strains infected the disease, the appearance of normal, but the pith part ulceration or only empty shell. 2. Comprehensive prevention technology and non-cruciferous vegetables for more than three years rotation, using deep sorghum planting. Use 1% to 1.5% of the seed weight of the farmer's anti-751, or 50g of Fengling and soaked seeds, mix thoroughly, dry and sow. At the seedling stage, spray or water 2-5 times with agricultural anti-ultraviolet-150 mg/kg; or 50 liters of water with Feng Ling 50 grams, dip or spray along the side of the vegetable root. At the beginning of the disease, 72% of agricultural streptomycin-sulfuric acid soluble powder is sprayed at 3000-4000 times, or 14% of colubridium-ammonia solution is applied at 300-400 times, once every 10 days, even for 1 or 2 times. Viral disease 1. Symptoms: The diseased mosaic type has multiple whole plants, with chlorophyll inhomogeneity, dark green and light green, sometimes malformed, and some ear-like processes along the veins. 2. Comprehensive selection of anti-virus disease technology, flood control at seedling stage, suitable for early sowing. In the early stage of onset, spray 20% of virus A WP 500 times or 1.5% of phytosanitary emulsion 100 times, 83 times of resistance agent 100 times, every 10 days, and prevent 3 to 4 times. White spot disease 1. Symptoms are mainly damaged leaves. At the beginning of the disease, leaves discolored with grayish white round spots, and then expanded into a light gray round to near-circular, with a diameter of 2 to 6 mm. There was a thick green halo at the periphery of the spot, but the halo around the dorsal lesion spot was sometimes not obvious, and was severely ill. Spots were evenly formed, resulting in the dead leaves, lesions are not easy to perforate, and gray moulds grow on the back of the lesions at the late stage of growth. 2. The comprehensive prevention technology is implemented in rotation. The appropriate sowing, adding basal fertilizer. In the early stage of onset, spray 25% carbendazim wettable powder 400 to 500 times, or 40% polysulfide suspension, or 50% thiophanate-methyl wettable powder 500 times, 50% mixed sulfur suspension 600 times Spray 50-60 liters per mu, 1 time every 15 days, total 2 or 3 times. Black spot 1. Symptoms are mainly damaged leaves. Foliar dark brown to black slightly raised small round spot, after the expansion of the edge was pale, the center of the light brown to gray-brown lesions, diameter 3 to 6 mm, concentric ring pattern is not obvious, when the humidity is light on the lesions Black mold. The diseased department is brittle and easily broken, and the incidence is heavy. The lesions confluent cause the leaves to die. Planting leaves, stems, pods can be disease, stems and pedicels lesions mostly dark brown oval plaques. 2. Comprehensive prevention technology implements a large area of ​​rotation. Seed dressing with 0.4% seed weight of 50% Formamide WP, or 75% chlorothalonil wettable powder, or 50% acetaminophen wettable powder. Before the onset of disease, 75% chlorothalonil WP can be sprayed 500 to 600 times, 50% acetaminophen wettable powder 1000 times, 50% sulfacin WP 1500 times, 50% metalaxyl zinc can be wetted 500 times liquid powder, 64% anti-virus WP 500 times, 7 to 10 days 1, even 3 to 4 times. 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