Symptoms: mainly damage the leaves floating on the water surface, the shape of the lesion is not fixed, and some were "S"-shaped, some shaped like a cocoon, brown or dark brown, necrotic area later appeared white wrinkled spheroid mycelium, after the brown tea-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. At the beginning of onset, spraying 50% carbendazim WP 800 times or 70% thiophanate-methyl WP 800 times standing committee, 50% mixed sulfur suspension 600 times, 30% basic copper sulphate suspending agent 500 times liquid, once every 10 days, continuous control 2-3 times.
Plasma Products,Anti-Hbs,Safe Plasma,Safe Plasma Storage
Sichuan Yuanda Shuyang Pharmaceutical Co., Ltd. , https://www.syimmunoglobulin.com