The occurrence of this disease is widespread and the damage is severe, resulting in a large amount of fallen leaves and a huge loss. The pathogen is a fungus of the genus Aspergillus spp.
I. Symptoms: When the symptoms are detected, brown spots appear on the leaves and gradually expand into round or near-circular lesions with a diameter of 4 to 12 mm. In severe cases, the lower leaves fall off early and gradually spread upward. The leaves will fall. Rainy and moist are the main conditions for producing spores. There are water droplets on the leaf surface, and at the appropriate temperature, it can invade within 6 to 10 hours. Symptoms appear within 3 to 6 days. Yellow flowers have poor disease resistance.
Second, prevention and control technology
1, field cultivation, selection of disease-resistant varieties.
2. In winter, disease branches are cut off, and the leaves in the fields or basins are usually cleaned up and burned.
3, pay attention to spray protection, from April, once a week spray 1:1:160 Bordeaux mixture; 6 to 8 months still need to spray Bordeaux mixture, or 50% carbendazim WP 500 to 800 times liquid ; Or 75% chlorothalonil WP 500 times; or 70% mancozeb WP 500 to 600 times.
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