This disease is a common disease of sweet-scented osmanthus, and it mainly affects the leaves of sweet-scented osmanthus. The pathogenic fungus is a fungus of the genus Clostridium spp. that causes the mycelium to overwinter in diseased leaves. Poor tree vigor or poor ventilation and light environment is easy to disease.
1. Symptoms of damage
1.1 In case of damaged leaves, the lesions are initially light brown and gradually expand, reaching a diameter of 2 to 10 mm. They are often limited by veins and are irregular in brown color.
1.2 lesions edge dark brown, with a clear outline, and scattered black spots.
1.3 Severe disease, Osmanthus leaves yellow, off, affecting the viewing.
2. Control technology
2.1 Strengthen conservation management, enhance plant resistance to disease, and pay attention to improving ventilation and light transmission.
2.2 Winter cleaning of the garden, removal of diseased leaves, cleaning of fallen leaves, and concentrated burning?
2.3 Gui Gui long-term, from June to September, with a 1:1:100 equal amount of Bordeaux fluid protective agent; or 65% dexamethasone wettable powder 500 times; or 50% benzene to wettable powder 1000 to 1500 Double liquid spray control, spray once every 10 to 15 days, 3 to 5 times spray prevention.
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