How to control brown spot of sweet-scented osmanthus

Sweet-scented osmanthus brown spot is a common disease of sweet-scented osmanthus, which is caused by subphylum fungus infection. Sweet-scented osmanthus plants are planted in ground and potted plants. Light cases affect the ornamental effect, and serious ones cause plant death. Most of the symptoms occurred in the leaves, and most of them developed from the leaf tip and edge to the whole leaf. At the initial stage, the plaque was light gray, and then it showed irregular fan-like expansion. In the later stage, the plaque gradually dried up and showed brown, with black grains. The occurrence regularity of the pathogen overwintered on the diseased body of the plant and spread by means of wind, rain and watering, and the disease was the most serious from the end of spring to the Mid-Autumn Festival in the north. Prevention and control methods 1. Remove the remains of diseased plants in time; 2. Strengthen water and fertilizer management and enhance plant disease resistance; 3. The sprouting environment should be ventilated and transparent, do not spray during the disease period, and avoid rain; 4. Timely control of shell insects, aphids and other piercing pests; 5. Spray 500 times of 70% mancozeb wettable powder twice before entering the house at the end of autumn; 6. If it occurs, you can use 90% chlorothalonil 500 times or 50% carbendazim 500 times for prevention and control. Click to get more sweet-scented osmanthus planting techniques