The main insect pests that injure the radish production are maggots, cabbage caterpillars, yellow stripe fleas, and the diseases are mainly downy mildew, black rot, and virus diseases. The prevention measures are as follows: First, the disease 1. Downy mildew: Downy mildew in radish mainly damages the leaves. The onset began with the outer leaves, with pale green to pale yellow spots on the foliage, yellowish-brown on enlargement, limited by the veins into polygons. When wet, leaves appear white on the back, and the outer leaves die when severe. The chemical control was 72% frost-urea Mn-Zn wettable powder 600-800 times, or 69% ank manganese zinc wettable powder 1000 times, or 72.2% Prec 600-1000 times liquid for foliar spray. 2. Black rot: Black rot is a disease caused by black rot. The main symptoms are the darkening of the center of the root and the blackening and decay of the vascular bundles of the fleshy roots. High temperatures and rain, excessive irrigation, poor drainage, end-of-fermentation, continuous cropping, and artificial wounds or insect damage are more conducive to disease. Chemical control can be sprayed at the early stage of the disease, 41% of the Goodrich suspension agent 5000 times, 72% of the agricultural streptomycin 3000-4000 times solution or 50% DT wettable powder 500 times, 7-10 days, continuous control 2? 3 times. 3. Viral disease: Virus disease plants are obviously dwarfed, and the leaves are yellow-green in color or deformed. Locusts are important media. Extensive field management, high temperature and drought, aphids, a large amount of jump or a weak plant growth is more serious. In the early stage of disease, we can use 1.5% of plant disease spirit 500 times solution or 20% of virus A wettable powder 500 times solution and spray 2-3 times. In order to enhance the resistance of plants, at the same time pay attention to prevent high temperature and drought. Second, pests 1. Locust: When the average number of tapeworms is 3-5 per plant, control should be sprayed: 40% dimethoate 800-1000 times, or imidacloprid 1000 times. 2. Pieris rapae: The larvae of Pieris rapae mainly damage the leaves. Larvae of the caterpillar larvae had low food intake before the third instar and had poor drug resistance. The control of the larvae was suitable for the first trimester of larvae. Chemicals control selection 10% Divided 1500 times the suspension agent, or 2.5% Lai Hi suspension agent 1000-1500 times and so on. 3, yellow striped jumper: Both adult and larvae cause harm. Adults bite on the leaves, and the larvae damage the roots. The radish fleshy roots turn black and rot. Chemical control use 50% phoxim 1000 times spraying leaf or root.
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