Black spot, also known as black mold, is an important disease of Chinese cabbage in Beijing. Once it happens, the damage is serious. Apart from harming Chinese cabbage, the disease also harms cruciferous vegetables such as radish, cauliflower, rape, and cabbage. At present, the prevention and control of melasma in the late period of Chinese cabbage must be done in Beijing. Damage symptoms Chinese cabbage was mostly infected by black spot pathogens and began to grow from the outer leaves. The early infections were water-stained, light brown, and round spots. They turned dark brown and had unobvious concentric ring patterns. When the humidity is high, there is a black mold on the lesion. The lesion is 2-6 mm in diameter. The stems and leaves were injured, and the lesions were fusiform, slightly concave, dark brown, with looming ring patterns, and the diseased part was slightly rotted at high humidity. In severe cases, the lesions expand into patches, causing the diseased leaves to fall off or all the outer leaves to die. Planting stems and pedicels lesions dark brown, oval. The lesions are nearly round in shape, with gray in the middle and brown in the edges. The seeds are small and not full. Control methods Selection of disease-resistant varieties: selection of Xiaoqingkou, Beijing Xin No. 1, Beijing New No. 3, Beijing New No. 5, Beijing 88, Zheng Za 2nd, Jinqing No. 9 and other disease-resistant varieties. Seed treatment: soaking in warm water at 50°C for 25 minutes, sowing after sowing; 75% chlorothalonil of seed dressing weight 0.4%, or 0.3% seed of Fermi, 70% mancozeb. Cultivation and management: The plant is densely planted, so that the plants receive sufficient light to increase the ventilation and light transmission of the vegetable fields. Appropriate organic base fertilizer, increased application of phosphorus and potassium fertilizer, the best use of formula fertilization to ensure adequate nutrition, robust plants, improve disease resistance. Remove diseased leaves and diseased bodies in time to carry out idyllic harmless treatment to reduce field diseases. Agricultural measures: When two-year non-cruciferous vegetables were planted for rotation and arranged for a mouthwash, the cabbage field was kept away from cruciferous vegetable fields. Chemical control: In the early stage of disease, 99% mineral oil 250 times solution plus 50% acetaminophen wettable powder 1000 times solution, or 75% chlorothalonil 600 times solution, or 50% chlorhexidine WP 800 times Liquid, or add 50% of thiram to WP 500 times, or add 64% of WP to 500 times, or add 50% of WP to 1000 times, or add 70% of mancozeb Wet powder 600 times liquid and other agents mixed spray, spray once every 7 days, even spray 3-4 times.
Our special intermediates are mainly a combination of our own actual product structure and product properties, including: 1. The product does not belong to any other product of our company intermediates, 2. Chemical reaction type is more special 3. Can be used to synthesize two or more kinds of API which roles is almost equivalent and difficult to separate the level. 4. This intermediate is somewhat less used for actual production or less practical use. We summarized the above four cases of intermediates temporarily as a special intermediate, if the special intermediate application is enlarge, we will adjust it according to the actual situation to change its "identity."
Special Intermediates,Tofisopam Intermediates,Amisulpride Intermediates,Antithrombotic/Blood thinners Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com