Chemical control of long spot disease of Flammulina velutipes

At present, the main symptom of the disease that harms Flammulina velutipes is to produce some spots on the mushroom lid. What kind of disease is this and how to prevent it? black spot. This is a bacterial disease caused by Pseudomonas. After the onset of the disease, Flammulina velutipes lid appeared oval brown or dark brown spots, initially needle-like, expanded to 2mm in diameter, the edge was neat, and sometimes the cap cracked. Prevention and control methods: the most important thing is to control the appropriate temperature and humidity. When sprinkling water on the mushroom room, do not sprinkle water directly on the fruiting body of Flammulina velutipes, especially do not spray with cold water. The humidity in the mushroom room should not be higher than 90% for a long time, depending on the weather. Sprinkling water should be light, diligent and fine in sunny days, and less or no sprinkling in cloudy and rainy days. Strengthen ventilation after each sprinkling, and then cover with plastic film. During the period of mushroom production, the indoor temperature should be set below 17 ℃. After the onset of the disease, the diseased mushrooms should be removed in time and sprayed with 100 million 200 units of agricultural streptomycin or bleach 600 times per milliliter. Rust spot. The disease is caused by Pseudomonas aeruginosa and is mainly infected with Flammulina velutipes lid, which is needle-shaped at the beginning, and then expands to the size of sesame grains. Although the edges are irregular, the disease spots can be combined with each other to form irregular rust spots. Prevention and control methods: in order to prevent the occurrence of rust spot, do not directly sprinkle the fruit body when sprinkling water on the mushroom room, ventilate in time after sprinkling water, indoor air relative humidity should not exceed 95% for a long time, and wait for the fruit body water to dry when the surface of the bacterial bag is covered with plastic film. At the initial stage of the disease, the spread of bacteria to healthy fruiting bodies should be prevented and sprayed with 800 times 50% carbendazim or 100 million 200 units of agricultural streptomycin per milliliter.