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Main Diseases and Insect Pests of Autumn Vegetables and Their Control
Fall is a season of crops and pests in vegetables and other crops. The main pests and their methods for controlling pesticides are summarized as follows: 1. Cabbage downy mildew. The lesions were polygonal or irregular, with white frost hair on the back of the corresponding parts. Prevention and treatment of drugs are B-aluminum, 1258 grams per acre medication or metalaxyl 75 grams per acre medication. A sticky, mushy paste with outer leaves often wilting to reveal leaf ball. 2, Chinese cabbage soft rot disease. After the soft tissue is infested, it becomes water-stained and translucent, and there is odor. The diseased tissue becomes a sticky and slippery paste. The outer leaves often show off the leaves. The disease can damage dozens of vegetables and can continue to spread and infect in the field. The control agents were streptomycin, 100 kg of water per packet, or 600 times of 70% enemy liquid. 3, cabbage black spot and anthrax. The black spot is light brown to dark brown with halos around and black mold on the lesions. Diseased leaves infected by cabbage anthracnose, the lesions are white round spots, lesions on the petioles are mostly prismatic light brown, with pale red sticky material. The agent that can be used to control these two diseases is mancozeb zinc 125 grams per acre, or 50% carbendazim 75 grams per acre, spraying 2-3 times. 4, cabbage virus disease. The disease symptoms are leaf shrinkage, malformation, mosaic, dwarf plant shape, veins transparent, leaves often bent to one side, uneven foliage, dark green the same, sometimes there are a large number of rings on the leaves dead spots. Prevention and treatment should mainly be done at the seedling stage, and 40% dimethoate and vinegar can be sprayed in water at a ratio of 1:1:1500. 5, locusts. There are mainly vegetable tuberculosis and peach aphid, the victim leaves are curled, the vegetable strain is seriously dehydrated, the plant shape is dwarfed, the aphid can also spread the virus, cause cabbage virus disease, can use 40% omegar and vinegar to add water (1:1:1500) ) Spray control. Spodoptera litura. The newly hatched larvae of the insects forage on the back of the leaves, leaving only the epidermis and veins; after 3rd age, they are scattered and infested. When they are severe, they can eat the leaves and even bite the delicate vegetable stems. After the 5th instar, they can feed on the fruit. The agents used for prevention and treatment are 40% acephate 150 grams per mu, or 20% to sweep 50 grams. 7, yellow striped skipper A. The larvae have 3-4 cm of soil stripped roots and wheat husks. Adults like to eat young tissue. Leaves are often bitten into many small holes, available 80% trichlorfon dose of 85 grams per acre, or 2.5% of the amount of emulsion killed 25 grams per acre, add water spray control.