Autumn is the stage of white radish and long fruit, and some pests and diseases follow. Common pests and diseases of radish include black root disease, black rot, heart disease, and viral disease. Their pesticide control methods are as follows:
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Black root disease mainly harms the roots. In the later stage, the symptoms appear in the area where the lateral roots are born. The skin of the diseased part is purple to black, and the root hair is enclosed. The unsensed parts continue to grow, the susceptible parts shrink and crack, and the radial stripes expand inward, causing the tissues to become hard and have no edible value. Poor drainage in the field, soil stickiness and off-season cultivation are prone to disease. In the early stage of the disease, spray 72% DuPont dexame WP 1000 times solution or 72.2% Plex water agent 400 times solution, spray 2-3 liters per square meter.
Disease black rot mainly harms leaves and roots. The leaves are infected, the leaf margin is a "V" shaped lesion, the veins turn black, the leaf margin turns yellow, and the leaf expands and the whole leaf. The root-causing catheter becomes black, the internal tissue is dry and rot, the appearance symptoms are not obvious, and the pith is mostly black and dry, and then a cavity is formed. High temperature and rain, excessive irrigation, poor drainage, end-of-fertilizer, continuous cropping and artificial wounds or insect wounds are more conducive to the onset. In the early stage of the disease, 41% of the good gram suspension agent 5000 times solution, 72% agricultural streptomycin 3000-4000 times solution or 50% DT wettable powder 500 times solution can be sprayed, 7-10 days once, continuous prevention and treatment 3- 4 times.
The phenomenon of cavitation in the center of the xylem of the radish root of the heart disease is called a heart, which is a common physiological disorder. At first, large cells in the xylem parenchyma are far from the transduction tissue, and the sugar is reduced or even disappeared, resulting in a cell gap, followed by bubbles, and finally forming a heart. Early-maturing varieties with short growth period and large varieties with loose flesh are easy to heart. Insufficient water supply in the middle and late stages of radish growth, radish bolting, and high temperature and dry environment during storage are prone to sputum. It is necessary to strengthen the management of fertilizer and water and keep the soil moisture even. Radish 3-5 leaf stage, 15% of all-effect azole powder per acre with 50 grams of water spray to prevent sputum, and improve yield and quality. The temperature during storage is controlled at 0-2 degrees, and the relative humidity is preferably 90%-95%.
The virus-like plants are obviously dwarfed, and the leaves are yellow-green and malformed. Aphids are important media. The field management is extensive, high temperature and drought, the amount of aphids and fleas is large, or the growth of plants is weak. At the beginning of the disease, 8% of fungicides can be used, 1200 times of bacteria, 1200 times of water, and 1.5% of phytopathic water, 800 times per 7-10 days, 2-3 times in a row; Fertilizer 800 times liquid every 7-10 days to enhance the resistance of the plant, and the effect is better with the planting disease or the bacteria.
Insect mites can use 70% Emerald water dispersing granules 1-2 million times or Yunda acetamiprid emulsifiable concentrate 1000 times liquid or 15% gold good years ( integration of insecticide butyl thiocarbamate and imipenem) Agent) 1500 times of emulsifiable concentrate; "shell worm" such as eucalyptus, yellow stripe, etc. can use 10% of high-efficiency baibai emulsifiable concentrate 3000 times solution or 4.5% of Yunda emulsifiable concentrate 800 times liquid; Plutella xylostella and beet armyworm It can be controlled by 10% emulsified concentrate or 2% avermectin 1500 times liquid; underground pests such as earthworms and ground tigers can be rooted with 4.5% of Yunda's 800 times liquid.