Control of Trichoderma viride in Ganoderma lucidum

Green Trichoderma (TrichodermaviridePers.exFr.) It belongs to Trichoderma, Trichoderma.

1. The morphological characteristics of hyphae are slender, colorless, septate and much branched. Conidiophores arising from the lateral branches of hyphae, opposite or alternate, usually with 2-3 branches, bottle-shaped or conical pedicels bearing conidia. Most of the conidia are spherical, and the spore walls are verrucous, green or turquoise. On PDA medium, the colony was white flocculent at first, and then dark green. two。 The regularity of the disease (1) the conidia are transmitted by air flow, water, insects and so on. Old mushroom houses, germ-carrying tools and raw materials are the main sources of primary infection. The conidia produced after the disease can be eroded repeatedly. (2) the occurrence conditions are widely distributed in soil, air and all kinds of organic matter in nature, and it is easy to be infected if the culture material is not sterilized thoroughly or the fermentation is not good. The spore germination ability of Trichoderma viride was the highest at 15-30 ℃, and the mycelium could grow in the range of 4-42 ℃, and the fastest growth was at 25-30 ℃. The high temperature environment was beneficial to spore germination and mycelium growth, and favored slightly acidic environment, but pH above 7 did not die. 3. Trichoderma will be infected by Trichoderma in the process of strain expansion and cultivation. Trichoderma viride has strong adaptability to the environment and contains high activities of cellulase and cellobiase, which is easy to occur on the substrate rich in lignin and cellulose. Once infected, the whole material layer shows a green color and secretes toxins, which destroys the hyphae and cytoplasm of the host and causes the host to die quickly. Can be described as devastating and catastrophic diseases and miscellaneous bacteria. 4. Prevention and control methods (1) give priority to prevention, do a good job in the cleaning and hygiene of the production site, the ingredients should be fresh and dry, the proportion should be correct, and the sterilization should be thorough. (2) the pollution found in seed production should be abandoned and redone; when the cultivation bag is contaminated, the focus can be dug out, and the focus can be locally sprinkled with lime powder or fungicide, and the serious ones should be burned; when the tree is locally infected during cultivation, part of the bark and essence of the diseased tree should be cut off with a sharp knife, and fungicides should be smeared. If the pollution is serious and widely distributed, it should be burned centrally. (3) 0.1% of 70% topiramate was added when mixing, and a better control effect could be achieved by high pressure sterilization.