Tomato planting techniques: what are the diseases of autumn tomatoes?

What are the diseases of autumn tomatoes? How to control autumn tomato diseases? Please give instructions on the prevention and control of autumn tomato diseases, such as virus disease, late blight, leaf mold, early blight, etc.; detailed control methods can be referred to the following: first, tomato virus disease: it is a prominent disease of facility tomato in autumn. the virus sources are tomato yellow mosaic virus, tobacco mosaic virus and cucumber mosaic virus. a variety of virus diseases can be caused by mixed infection of several virus sources in the field. Sunshade nets and insect control nets should be used to reduce greenhouse temperature and block venomous pests such as whiteflies, aphids and thrips; timely ploughing to promote root development; reasonable watering according to plant and weather conditions to prevent overgrowth; pay attention to balanced fertilization to prevent premature senescence and enhance disease resistance; do not smoke in field operation, keep healthy plants before pruning and branching, and wash hands that have come into contact with diseased plants with soapy water. Timely use of color swatches and pesticides to control virus-borne pests. Second, tomato late blight: it is a destructive disease of tomato, which has the characteristics of rapid onset and rapid spread. once it occurs, if it is not timely and reasonably controlled, it can be extended to the whole shed in a short time to cause seedling pulling. Attention should be paid to ventilation, temperature regulation and humidity control, to avoid leaf condensation or the formation of water film, to avoid overcast and rainy days after watering, and to properly control watering after the disease. It was found that 72% frost urea manganese zinc wettable powder, 68% fine nail cream manganese zinc water dispersible granule, 52.5% azolidone urea cyanide water dispersible granule, 25% pyrimethrin suspension, oligomale Pythium wettable powder (not used with chemical pesticides, should be sprayed in the morning or evening, and should not be sprayed in the sun or before rain). Smoke control at room temperature should be used as far as possible. Third, tomato leaf mold and early blight can cause leaf drying and yield reduction when the disease is serious. The temperature and humidity should be adjusted reasonably to avoid overcast and rainy days after watering, and watering should be properly controlled after the disease; 40% flusilazole EC, 10% difenoconazole water dispersible granules, 47% spring leomycin king copper wettable powder, oligomale Pythium wettable powder (same as above) and other medicament sprays were selected at the initial stage of the disease. It can be prevented by regular fumigation with sulfur fumigator before onset. Click to get more tomato planting techniques click to get more vegetable planting techniques