In the early stages of disease symptoms, the above-ground leaves of the diseased plants faded, and a large number of white mycelium and brown rapeseed-like sclerotia were born at the stem base and the ground, and the disease growth weakened, withering, or the whole plant withered. (right)
Pathogen Sclerotium rolfsii Sacc. Slightly known as Sclerotium sclerotiorum is a semi-known indocyanine fungus. The sexual state is Athelia rolf-sii (Curzi) Tu. & Kimbrough. It is called Rhizoctonia and belongs to Basidiomycotina fungus. The mycelium was white, lush, and spread in a radiant manner on PDA medium. The mycelium was 2-8 μm thick. The branches did not form a right angle with a septum. The sclerotia were initially milky white, and later became pale yellow to dark brown or tan. Oval, size 1-2mm, smooth and shiny surface. The sclerotium surface consists of three layers of cells, the outer layer is tan, the epidermis layer is pseudo-thin-walled tissue, and the middle is a thin-wire tissue.
Transmission Pathway and Pathogenic Conditions The bacterium nucleus or bacilli is overwintering in the soil left over from the diseased body. When the conditions are suitable in the next year, sclerotia or mycelium producing hyphae initially infect, and the fungal fibroin-producing hyphae extended by the diseased plant. The contact with neighboring plants or sclerotia is transmitted by the water stream for re-infection, spreading the disease. Continuous crops or earthy viscous and low-lying or high-temperature and humid weather or seasonal heavy disease.
Prevention methods (1) Avoid severe disease and continuous cropping. (2) Advocate the use of compost made from Japanese enzyme bacteria or fully decompose organic fertilizer. (3) Inspect it in time and find that the diseased plant was removed and burned in time. The diseased hole and its neighboring plants were irrigated with 5% Jinggangmycin Aqueous Solution 1000-1600 times, 50% Tianshui Aqueous Agent 500-600 times, 20% Acetochlor Phosphate EC 1000x, 90% Dynedex Wet powder 500 times liquid, each strain (hole) drenching 0.4-0.5L. Or use 40% of the seedlings and fine sand to be mixed with 1:200 times the amount of medicine soil mixed into the soil, each hole 100-1508, every 10 to 15 days 1 time. (4) Use cultivated H. harzianum 0.4-0.45kg, add 50kg fine soil, and mix and then withdraw to the base of the diseased plant to effectively control the disease expansion. The drug was stopped 5 days before harvest.
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