Identification and Prevention of Main Diseases of Autumn Radish

Downy mildew: Symptoms of mid- and late-stage disease are the most important, mainly affecting the leaves. The disease spreads from the lower leaves to the upper leaves, with irregular irregular green-yellow spots appearing on the initial leaf surface and then expanded to a polygonal yellow-brown lesion. When wet, white mold grows on the back or both sides of the leaf, and when the disease is severe, the leaves become dry. Incidence of the law: The disease is a fungal disease. The temperature is about 16°C and the relative humidity is higher than 70%. When the variety is susceptible to disease and the bacteria source exists, the disease easily spreads rapidly. Generally sowed early, varieties of poor resistance, too close planting, humidity in the field, extensive management and disease incidence. Prevention methods: 2 years or more of rotation with non-cruciferous vegetables; removal of diseased plant debris, concentrated treatment; timely fertilizer, watering, in order to enhance resistance. In the early stage of disease, 72.2% Preclosure 600 to 800 times, or 75% chlorothalonil wettable powder 500 times, or 64% antipoisonous 500 times spray control, spray every 7~10 days, even Spray 2 or 3 times.

Symptoms of soft rot: The main hazards are roots, leaves, and petioles. The roots became infected and often started at the root tip. They were initially brownish and immersed in soft rot. They gradually spread upward, causing soft rot in the heart. The leaves and petioles were infected, and they were also immersed in soft rot. In the event of drought, the disease stopped expanding, and new leaves were clustered at the root tip. The disease department and the health department have obvious boundaries. Brown sap often oozes, causing the whole radish to turn brown and soft rot. The law of onset: The disease is a bacterial disease. The pathogen is mainly found in the soil and it is invaded by the wound. At 25 °C ~ 30 °C easy to disease. Prevention methods: 3 years or more of rotation with non-cruciferous vegetables; try to avoid causing wounds; adopt ridge cultivation or planting deep trenches. At the beginning of the disease, spraying 72% of agricultural streptomycin sulfate wettable powder 3000 to 4000 times liquid or 12% green milk copper emulsion 600 times liquid, spray once every 10 days, and even spray 1 or 2 times.

Symptoms of viral disease: The onset of disease can occur at the seedling stage, and the diseased plants are short, and the leaves are shriveled, uneven, distorted or show a yellow-greenish mosaic. Incidence of the disease: The disease virus is mainly transmitted by insects (such as aphids and triceratops), but it can also be transmitted through the leaf rubbing method. Excessive management in the field, high temperature, drought, aphids and fleas occur, plant growth is poor, disease resistance is poor, the incidence of disease. Control methods: remove diseased plants as soon as possible and strengthen field management. It is necessary to timely spray with 10% imidacloprid wettable powder 2000 times to control aphids; spray with 90% crystal trichlorfon 1000 times to control flea; at the beginning of the disease, use antitoxic agent I 250 times or 20% virus A wettability Powder or plant disease Ling II 1000 times spray control, once every 10 days, and even spray 2 or 3 times.

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