Tomatoes account for a large proportion in the cultivation of facilities in the autumn. Diseases are the major obstacles affecting the high yield and quality of autumn tomatoes, and prevention and control of autumn tomato diseases is very important.
Viral disease: an outstanding disease for tomato plants in autumn. The sources of toxicity include tomato yellow leaf curl virus, tobacco mosaic virus, and cucumber mosaic virus. A variety of virus diseases may occur in the field due to mixed infection of several toxic sources. Shade nets and insect nets should be used to reduce the temperature of the greenhouses, and to prevent insecticides such as whitefly, aphids, and thrips; timely cultivating, promote root development; watering according to plant and weather conditions to prevent leggy; pay attention to balanced fertilization to prevent premature aging, Strengthen disease resistance; do not smoke when operating in the field, pruning squatting, then whole strains after the whole plant, contact with the diseased plants to wash with soapy water; timely use of swatches, chemicals to prevent transmission of pests.
Late blight: It is a devastating disease of tomato. It has the characteristics of acute onset, rapid spread, and rapid epidemic. Once the disease occurs, if it is not timely and reasonably controlled, it can be expanded to a full shed in a short time and lead to pull. Attention should be paid to air release, temperature control and humidity control to avoid dew condensation or water film formation; avoid watery days and rainy days, and control watering after onset; 72% of the urea manganese zinc WP can be found in the diseased plants. 68% Fine Aloes Manganese Zinc Water Dispersible Granules, 52.5% Terconazole Clomazone Urea Cyanide Water Dispersible Granules, 25% Azoxystrobin Suspension, Pythium oligosporum wettable powder (do not use with chemical pesticides, should be morning or evening Spraying, should not be applied in the sun exposure or before the rain) and other agents spray. As far as possible the use of room temperature smoke application control.
Leaf mould, early blight: When the disease is heavy, it can cause leaf dryness and reduce yield. Should be reasonable temperature and humidity control, to avoid rainy days after the rainy days, after the onset of appropriate water control; early onset of the use of 40% fluosilazole EC, 10% difenoconazole water dispersible granules, 47% chloramphenicol Copper wettable powder, Pythium oligospirillum wettable powder (precautions as above) and other agents spray. Before the onset, sulphur fumigators can be used for regular fumigation prevention.