Osmanthus leaf blight occurs at the leaf margins and tip of leaves. Beginning with light brown dots, it gradually expands to irregular large patches. If several lesions are connected, the whole leaf will dry 1/3-1/2. Lesions are gray-brown to reddish-brown, sometimes brittle, with dark edges and slightly raised, with many small black spots in later stages of the disease. The back of the lesion is lighter in color.
The pathogenic bacteria used mycelium or conidia in the diseased leaves, diseased leaves in the winter, conidia spread by wind and rain. The optimum temperature for the development of the bacteria is about 27°C. In Guangzhou, the disease occurred mostly in July-November. Potted plants are sick when they are hot and humid, poorly ventilated, or when the plants grow weak. The disease occurred more often on the old leaves after the winter. The lower leaves of the plant occur more.
Control methods
1, horticultural control strengthen cultivation and management. Potted osmanthus must avoid water accumulation, increase humus fertilizer and potash fertilizer, in order to improve the resistance to disease. Diseased plants should be removed in time, and diseased leaves should be removed in winter to feed the source of infection.
2, during the period of disease prevention and control, the general can spray general tree maintenance, after the spray 50% benzene to WP 1000-1500 times liquid + new high-fat film 800 times, or 50% carbendazim 800-1000 times liquid + new high Lipid membrane 800 times for prevention and treatment.
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