The Eucommia ulmoides Oliver Eucommia ulmoides Oliver alias silk skin, silk cotton skin. It is a perennial woody plant of the Eucommia family. It mainly uses bark as its medicine, and it has the functions of supplementing liver and kidney, strong bones and bones, and tocolysis. It is a famous medicinal material in our country and it has a cultivation history of nearly a thousand years. Mainly produced in Sichuan, Yunnan, Guizhou, Hunan, Hubei, Shaanxi, Jiangsu, Zhejiang and other provinces.
Symptoms During eucommia ulmoides breeding, the base of the seedlings on the ground is brown and sag, and when severe, they contract and die, usually without lodging.
The pathogen Rhizoctonia solani Kuehn claimed that the lysate seedlings belonged to the fungus Aspergillus subsp. genus, and the sexual state was Thanatephorus cucumeris (Frank). Donko called melon-degrading bacteria and belonged to Basidiomycotina fungus. On the PDA medium, the flora was flat and white, with aerial mycelium growing rapidly. The hyphae were colorless, transparent, branched in a right angle, and shrank at the branches. The septum was near. The initial width of the hyphae was 2 to 3 μm. Some mycelium cells swollen into barrels at the later stage and tangled into sclerotia. The sclerotia are ovoid, with hyphae connected to each other. The surface is dark brown to tan. The edges are false thin-walled tissues, and the middle is sclerotinia. The size of sclerotia is 2-3 mm. Aging bacteria ribbon light yellow.
Transmission Pathways and Pathogenic Conditions The bacteria live for a long time in the soil. The disease mostly occurs in late April and late June. The soil moisture is high, and the seedbed is uneven and heavily populated.
Control methods (1) Select high-dry terrain, well-drained nursery nursery, and strengthen management. (2) Every 667m2 of 667m2 was sifted and sifted with ferrous sulphate 7.5-10kg before planting, and evenly spread on the surface of the seedling bed, and poured 43% formalin 1000 times in the initial stage of disease. In addition, you can also try new fungicides such as Greenhenge No. 1.
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