The day turns cold vigilance with gray mold

Cold weather, low temperature and high humidity in the greenhouse environment, the most likely to trigger gray mold, and gray mold is a common disease, but it has been one of the most difficult problems for farmers in the winter season, especially the cultivation of cherry tomatoes and beans Kind of vegetable farmers. Once the outbreak of gray mold, the rapid spread of the disease will cause a large area of ​​reduced production, or even out of production.

The reason why gray mold is difficult to control is mainly reflected in the following four points: First, the environment with low temperature and high humidity is difficult to improve; second, there is a large amount of spores after the onset of disease, and the speed of spread is fast; thirdly, it is strong in saprophytic origin and begins to infect from the residual flowers; It is easy to produce drug resistance by repeated use of drugs.

Understand the difficulty of prevention and control of gray mold, we can focus on production, targeted measures to take early prevention. Next, the reporter focused on introducing several measures for the reference of farmers.

First, use a stencil net shed. Before closing the shed, the corncobs that have been burned until smokeless are evenly divided into 6-8 piles and put into the aisle walkway. After that, the stencil nets are spread evenly on the corncob to smoke. The net amount of sclerotia and the duration of smoking are determined according to crops. For example, tomatoes can be used for 250 grams per mu and smoked for 8-10 hours; 200 mu for beans and eggplants and smoked for 6-8 hours. Practice has proved that this method can effectively kill plant pathogens, soil and pathogenic spores on the walls, reduce spores of pathogens, and prevent diseases.

Second, use spray sprays. The vegetable farmers all know that the residual flowers are equivalent to the "gateway" of the invasion of gray mold. Many farmers in the production have used pick-and-drop flowers to suppress the occurrence of gray mold. However, in the process of picking flowers, it is inevitable that there will be residue. Botrytis is still prone to happen. Therefore, reporters recommended vegetable farmers to use another method of prevention and control—pharmacy spraying. The operation is as follows: in the watering can, 52% of agrigenite 1000 times solution or 50% of aprotinine 1000 times solution is prepared, and spraying is alternately used for spraying, which is simple and easy. In actual agricultural operations, it is recommended that vegetable farmers pick flowers and spray flowers together to achieve better results. In this way, the bacteria of gray mold can be completely “rejected” and the occurrence of gray mold can be effectively prevented.

Finally, regulate the greenhouse environment to inhibit the occurrence of gray mold. Since the appropriate temperature for the incidence of gray mold is 20-25°C and the relative humidity is more than 90%, it is necessary to prevent and control gray mold by increasing the temperature and humidity. During periods when the relative humidity in the shed is high, try to increase the temperature of the shed and avoid the temperature of the disease. In addition, it is also possible to reduce the humidity in the greenhouse by pouring small water under the membrane, covering the straw with rice straw, and other measures.

Botrytis mainly infects from the site of the stray flower.