Symptoms: The main damage to the water surface of the leaves, lesions indefinite shape, and some were "S"-shaped, and some shaped like a cocoon, brown or dark brown, necrotic area later appeared white wrinkled ball-like mycelium, after birth, brown brown ball The small sclerotia, which have a heavy onset, brown and decayed leaves, are difficult to pull away from the water.
Pathogen: Sclerotium hydrophilum Sacc. It is known as Hibiscus sclerotiorum (Bacterial nucleus), a fungus belonging to the subphylum Fungi. Sclerotia spherical, elliptic to pear-shaped, early white, later turned yellow-brown or black, rough surface, size 315-681*290-664 microns, outer layer of dark brown cell size 4-14*3-8 microns, inside The layer is colorless to light yellow and has a loose structure. The size of cells in the tissue is 3-6 microns. The transmission route and the disease conditions are such that the sclerotium is left over in the soil with the diseased plants, and the sclerotia floats in the water for the following year. After the temperature rises, the sclerotia germinates and the hyphae invade the leaves. The germ development is suitable for temperature 25-30°C and is higher than 39°C. , less than 15 °C unfavorable disease, summer and autumn high humidity and more prone to rainy season.
Control methods:
1. Reduce the bacteria source, remove the diseased plants when harvesting, and bury or burn them in a concentrated manner.
2. Begin spraying 50% carbendazim WP 800 times or 70% thiophanate-methyl WP 800 times, 50% Sulfur Suspender 600 times, 30% basic copper sulphate Suspension 500 times, about 10 days 1 time, continuous control 2-3 times.
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