Cabbage black shank, also known as root decay, black root disease, is a soil-borne fungal disease. Cabbage seedlings and adult plants can be affected, especially at the seedling stage. At the seedling stage, light brown or off-white lesions are produced on the cotyledon, true leaves and young stems, round or oval, with small black dots scattered on the seedlings for the conidia; the lesions on the young stems are slightly sunken. Severe disease seedlings appear black roots and soon die. The symptoms of mild disease seedlings are not easy to be found, which may cause plants to colonize diseased plants and cause plant damage. At the adult stage, lesions on the diseased leaf were the same as those at the seedling stage, and purple-black streaks were produced on the main roots and lateral roots, causing the roots to decay, or to collapse from the diseased stems. When the disease is heavy, lesions with dark spots appear outside the leaves of the plants. After the whole plants turn yellow, they die and die, seriously affecting the yield and quality. Control methods Seed treatment soaked in warm water at 50 °C for 20 minutes, remove and germinate after drying. Use 50% thiram or DT wettable powder dressing, the amount of the agent is 0.4% of the seed weight, can also be used green seed No. (myhybrid) seed dressing. Pay attention to not boring after dressing, so as to avoid phytotoxicity. Seedbed soil treatment can be used 40% thiram cans, 8 to 10 grams per square meter of pharmaceutical, mix 30 to 40 kilograms of fine dry soil, sow on the bed when sowing. The rotation cropping field should be changed in a timely manner, and rotations with more than three years of non-cruciferical vegetables or field crops should be effective. Density should not be too large seedbed sowing density should not be too large, and in 2 to 3 true leaves as soon as possible seedlings, seedling density should not be too large. Also pay attention to timely ventilation and reduce the humidity in the shed. After spraying the cabbage, the cabbage will be sprayed with green broth No. 2 (Yoshimetsu Fumei Double) 1000 times after spraying out. Afterwards, it will be sprayed once every 7 days and sprayed 3~4 times. Can also be used 75% chlorothalonil WP 600 times or 60% Duofu WP 600 times spray, spray 7 days, even spray 3 to 4 times. Http://Content/87793468-9da8-48de-9633-a276d4d71c7c?cType=2 Valentines Gummies,Valentine Gummy Candy,Valentine'S Day Gummies,Valentine'S Day Gummy Candy Montreal Shantou Food Co., Ltd , https://www.montrealsnack.com
Black Cabbage Seedling Early Prevention