Product Pre-cooling Washing Equipment Product Pre-Cooling Washing Equipment,Head Claw Spiral Pre Cooler,Stainless Steel Spiral Pre Cooler,Large Capacity Pre Cooler Zhucheng Haoze Machinery Co., Ltd , https://www.slaughteringequipment.com
How to prevent powdery mildew in mango flowering
Powdery mildew is a significant fungal disease that affects mango trees during the flowering stage, primarily targeting the inflorescences, young fruits, and leaves. Initially, small white powdery spots appear on the infected parts, which then expand into a thick layer of white mold covering the affected tissues. As the infection progresses, the moldy areas turn brown and become necrotic. The flower stalks and scapes are especially vulnerable, leading to poor development of flower buds. Infected parts are covered with a layer of fungal spores, causing the inflorescences to darken and potentially fail to bloom. When young leaves are infected, a layer of mildew develops on the back of the leaf veins, and light gray spots may appear on both sides. Severe infections can cause the leaves to curl and drop prematurely. In the case of young fruits, the entire surface becomes covered in mold, leading to fruit drop or the development of small, deformed fruits. These fruits may continue to grow but develop a purple-brown, cracked skin with corky tissue underneath.
Among mango varieties, India No. 2 and Ivory Mountain are the most susceptible, followed by Lusong Mountain. In contrast, Qiumang and Qingpi show higher resistance to the disease. To manage powdery mildew effectively, several control measures can be implemented. First, it's important to select disease-resistant cultivars whenever possible. Second, avoid overuse of nitrogen-based fertilizers and instead increase the application of organic matter along with phosphorus and potassium fertilizers to strengthen plant immunity. Third, chemical control plays a crucial role. Fungicides such as those containing sulfur, mancozeb, or other effective compounds should be applied at the right time and in the correct concentration.
During the new shoot stage, lime sulfur can be used, but the concentration varies depending on the season. In spring and autumn, a 0.4–0.5° Baumé solution is recommended, while in winter, it increases to 0.8° Baumé, and in summer, it should be reduced to 0.2–0.3° Baumé. Once flowering begins, options like 20% rustin EC diluted 3000 times, 15% rustin wettable powder at 3000–4000 times, or 40% polysulfide suspension at 350–500 times can be applied. Sulfur powder with a mesh size of over 250–300 can also be used. Spraying should occur every 15–20 days, with an interval of 7–15 days between the last three types of treatments. It's important to avoid applying sulfur when temperatures are too high. For best results, sulfur should be sprayed before morning dew has fully evaporated.