Volsen owns a professional custom synthesis department, with more than 15 senior scientific research chemical personnels who have a graduate degree or above. We also have an independent scientific management system. Our company integrates years of production experiences and talent reserves that forms a strong R&D production capacity, furthermore we could undertake various chemicals customizations from kg to ton relying on the existing production base and equipment.
With the accumulated strong expertise,and experiences of developments,we have developed the products with good quality and also manufactured the intermediates for multi-national pharmaceutical company. R&D Pharmaceutical, Research And Development Pharmaceutical, Bulk Drug Development Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com
Purple spot disease is one of the most important diseases on the production of onions. It mainly damages the leaves and pedicels, and also affects bulbs during onion storage. The diseased part first appeared as a water-soaked white spot, then expanded, becoming elliptical or spindle-shaped, gradually changing from light brown to gray-brown or gray-purple, slightly depressed in the middle, surrounded by yellow halos, and concentric wheels in the diseased part when the humidity was high. Stains arranged in gray and black mold, onion stored and transported, often onset from the top of the onion, decayed when wet. Purple spot disease occurs during onion growth. The diseased leaves should be removed in time to bring deep burial outside the field. In the initial stage of disease, 58% methine zinc WP or 64% MnZn WP can be used. 75% chlorothalonil wettable powder 500 ~ 600 times spray, every 7 to 10 days once, continuous control 3 to 4 times, pay attention to alternate medication. Adding 5-10 grams of neutral laundry detergent per 10 kilograms of liquid can increase the adhesiveness of the liquid. In order to prevent purple spot disease from continuing to harm during the storage period, the onion should be harvested after ripening on the top of the onion, dried and stored outside until the bulbs are dry, the cellar temperature is controlled at 0°C, and the relative humidity is controlled below 65%.