It is crucial to prevent the occurrence of diseases and cut off the transmission routes. The transmission routes of diseases that are highly prevalent in greenhouses mainly include air flow, water, organisms and other factors. However, the transmission routes of different diseases are different. Vegetable farmers should formulate reasonable prevention and control strategies based on the transmission characteristics of different diseases.
Spray + smoke can cut off the spread of airflow
Air current transmission is the main mode of transmission of many pathogens. The spores produced by fungi are small and light, and can easily spread quickly and far with air currents, such as gray mold, downy mildew, powdery mildew, etc. For diseases that spread in greenhouses with airflow, attention should be paid to comprehensiveness in prevention and treatment. Taking the typical gray mold as an example, when preventing and treating this disease, we should not only use spraying, but also combine it with smoke fumigation to kill pathogenic bacteria suspended in the air.
Reduce contact between water and pathogens
Generally speaking, diseases such as bacteria, fungi, and oomycetes are prone to occur under high temperature and high humidity conditions. Among them, root diseases (bacterial diseases) and oomycete diseases are mainly spread through water. Some bacteria have flagella, and oomycetes can produce zoospores, which are mainly spread through dew condensed on the surface of plants. For diseases that spread through this route, if you want to prevent the disease from happening, you must first strengthen the humidity regulation of the greenhouse.
Specific measures: Choose high-quality shed film to reduce condensation on the surface of the shed film; cover the ground with mulch, straw, etc.; water under the film and provide reasonable ventilation and moisture removal. The germs of root diseases are in the soil or on the soil surface and can be spread with water after watering. The main feature of this disease transmission route is that the disease center is obvious. As irrigation proceeds, the pathogenic bacteria continue to spread and expand the infection area. Therefore, avoid diseased plants when watering.
In short, cutting off the transmission route can reduce the incidence of shed vegetables, and at the same time, prevent and control the disease with symptomatic drugs according to the pathogen.
Post time: Apr-08-2024
