Codonopsis pest control

Codonopsis is a commonly used traditional Chinese medicine, with root for medicinal purposes, with qi nourishing and spleen and stomach, Sheng Jin Qingfei and other functions. Indications of shortness of breath, weakness, Tianjin wound drink, weak spleen and stomach, loss of appetite, loose stools, lung deficiency and cough, fever after the weakness, qi deficiency prolapse and other symptoms of qi deficiency, use is very wide. The prevention and control methods of the main pests and diseases in its production are now described as follows: 1. Root rot often begins to occur during the high-temperature and high-humidity period in May and June in summer. Mainly occurs in the Codonopsis plants above 2 years old. At the early stage of disease, the lateral roots and fibrous roots near the ground turn dark brown, and when the rainfall is severe, the roots rot and the plants die, seriously affecting the yield. Control methods: 1 High temperature and rainy season, timely drainage, to prevent the accumulation of water in the field. 2 The diseased plants should be removed in a timely manner and sterilized by 5% lime emulsion to prevent spread. 3When the disease area is large, 50% carbendazim 500 times can be used to irrigate the ward. 4 Combine the site preparation and disinfect the soil with 70% pentachloronitrosynthetic powder per acre. 5 At the beginning of the onset, spray 50% thiophanate-2000 times or soaking roots, once every 7-10 days, 2-3 consecutive times. 6 Crop rotations in different families, such as soybeans, wheat and corn. Second, rust occurs from July to August each year, mainly harming leaves and stems. The back of the diseased lobe was uplifted with yellow spots. The late ruptured orange-yellow powder was emitted. After the onset of disease, the leaves were dry or early fallen. When the disease is severe, the root loss will reduce more. Control methods: 1 After the winter withered, clean the park and burn down the diseased plants. 2 In the early stage of onset, spray 50% dinitrate 200 times or 97% dichlorphyrin 400 times once every 7-10 days, successively 2-3 times, or spray with 25% triadimefon 1000-1500 times. 3 Set up scaffolds in time to change the ventilation conditions and reduce the humidity in the field. Thirdly, locusts mostly occur in summer and occur severely during droughts. They mainly absorb the tender leaves of young shoots and cause them to die. Control methods: 40% Dimethoate EC can be sprayed with 1500-2000 times liquid. 4. Tigers, earthworms and cockroaches often occur at the seedling stage and damage young shoots and roots of seedlings, resulting in lack of seedlings and reduced yield. Control methods: 1 25 grams of chlordane emulsified with 5 kg of bran fried wheat bran, add appropriate amount of water into the poisonous bait in the field to kill. 2 Watering the rhizosphere with insecticides and roots with a 50% solution of 500 mg of zinc phosphite EC and 1000 times of a 50% 6005 emulsion. 3 At the seedling stage, poison baits are made from 90% crystals of trichlorfon 100 grams and 5 grams of rapeseed cakes. 5. The red spider damages the seedlings and adult plant leaves, and sucks the leaf liquid, causing the plants to become yellow and dry. Control methods: use 50% killing pine 1500 times liquid spray. Source: Southern Rural News

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