Mushroom brown spot disease, also known as dry foam disease, often occurs on mushroom beds and is very harmful. Timely pesticide control is necessary.
First, when the symptoms occur, the brown spots appear on the stipe, the umbrella, and the pleats. The depression occurs, and the mushroom loses its toughness. When it is serious, the mushroom will rot. The shape of the young mushroom is changeable, the edge of the mushroom is jagged, or the stem is curved, and some are shaped like garlic, and the stem is thicker than the cap. In the case of the disease on the big mushroom, local brown spots are often produced, and the mushroom is dried and leathery at the later stage, and a gray mold layer is produced at the site of the disease. The difference between brown spot and white rot is that the mushroom rots slowly, does not flow brown mucus, and has no stench. In the early days, white rot was similar to brown spot disease.
Second, the source of the first source of infection usually comes from the cover soil. According to the pesticide network , the spores of the diseased mushrooms spread with the airflow. When the manual operation, the hands and tools contact the diseased mushrooms can also spread the infection. The disease is generally spread from the broken stipe of the stipe.
Third, the incidence of environmental factors The degree of disease is closely related to the temperature and humidity. Factors such as excessive temperature in the mushroom bed, poor ventilation, and dampness, as well as the accumulation of contaminated waste on the mushroom bed, can lead to disease.
Fourth, the main methods of prevention and treatment: (1) timely removal of diseased mushrooms. When the diseased mushroom is found, the diseased mushroom should be dug out together with the mycelium and the culture material at a depth of 10 cm, and burned or buried deeply. The diseased hole should be filled with disinfectant soil. At the same time, formalin disinfection tools are used to prevent infection. (2) Reduce temperature and humidity. Under the condition that the mushroom house is not cooled, the window is ventilated to reduce the temperature and humidity. The relative humidity does not exceed 95% and the temperature is lowered to below 17 °C. (3) Chemical control. In order to prevent the occurrence of diseases, the surface of the covered soil is sprayed with a 1:1:300 bactericide Bordeaux mixture before the mushroom grows, which can greatly reduce the infection rate. The surface of the mushroom bed can also be sprayed with 100 g of carbendazim or 200 g of methyl thiophanate plus 100-150 kg per 100 m2 of mushroom bed. (4) Others. If the above measures are adopted, the disease will continue to develop, and all the cover soil can be removed, replaced with disease-free soil, re-covered, and control the disease factors.
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