How to prevent and treat soft rot in Chinese cabbage
Bacterial soft rot of Chinese cabbage is also known as "rotten gills." The disease is a devastating disease, such as inadequate control and improper measures, which brings great economic losses to vegetable growers.
Symptoms of Infestation: Cabbage begins to develop in the heart-filling stage. The diseased plant begins to develop from the base of the petiole. The diseased area is translucent in the beginning of flooding, and afterwards, it expands to pale gray-brown wet rot. The diseased tissue is sticky and slippery. The surface of the disease is subsided after water loss. Spilled white bacteria often pus, and foul odor, sometimes causing pith rot. At the early stage of disease, the outer leaves of the diseased plants drooped and wilted under the hot sun, and they recovered sooner or later, and gradually recovered from the original state. The outer leaves of the diseased plants were flat on the ground and the leaves were exposed. Others start to rot from the outer leaf margin or leaf ball, and the diseased leaf becomes thin paper after drying. Diseased plants are easily kicked by their feet. During the storage of Chinese cabbage, the disease continued to develop, causing rotten pits.
Pathogens and Pathogenic Conditions: Pathogens are overwintering on carriers of diseased organisms, soils, uncontaminated farmyard manures, and off-season diseased plants, becoming an important source of primary infestation pathogens, and can occur between different hosts. It turns to harm. Pathogens can be transmitted through rainwater, irrigation water, fertilizers, soil, insects, and many other ways, and invade from the plant's wounds or natural cracks. According to the investigation results, it is shown that: Because the pests can carry pathogenic bacteria in vivo and in vitro, pests feed on the leaves and cause a large number of wounds, which become an important channel for the invasion of pathogenic bacteria of the disease. Therefore, serious field of pests occurs, and soft rot is more likely to occur, such as The speed of transmission is also rapid; high temperature and rainy, conducive to the spread and spread of pathogenic bacteria, Chinese cabbage wrapped in long after the rain, is conducive to the occurrence of soft rot, and the incidence of heavier; field long-term water, soil moisture content In the high fields, the incidence is also heavier.
Control measures: The selection of disease-resistant and disease-resistant varieties generally uses varieties with high callus ability, high barrel type, upright type, and green help type, such as: Beijing Xin 3, Jincai 3, and Taiyuan Erqing. Seedling stage began to control leaf and borer pests such as cabbage caterpillar, cabbage beet armyworm, beet armyworm, diamondback moth, vegetable cockroach, root clam, yellow striped triceps, etc., in addition, virus disease, downy mildew, black rot, etc. Disease can all aggravate the damage caused by soft rot. Therefore, we must do a good job of preventing and treating these diseases. Do a good job of disinfecting pathogens, remove the diseased plants in time, and disinfect the lime in the diseased areas.
Chemical control: seize the key period, timely application of pesticides. After cabbage is planted, 72% of agricultural streptomycin 3000-4000 times or 20% of Jinggangmycin water solvent can be used, and 25 grams of water per bag can be used to prevent spraying. Can also be used 45% Dyson ammonium 900 times liquid; 77% can kill WP 800 times spray. The pharmaceuticals should be used alternately, sprayed once every 7-10 days, and sprayed 2-3 times; spraying should be thorough, in addition to spraying all over the field, it should also focus on the petiole and stem base and root base near the ground. About 100 grams were sprayed so that the liquid flowed into the cabbage and into the root of the cabbage.
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