Tomatoes account for a large proportion in the cultivation of facilities in autumn. Diseases are the main obstacles affecting the high yield and quality of autumn tomatoes, and prevention and control of autumn tomato diseases is very important.
Viral disease
As the outstanding diseases of tomatoes in autumn, there are tomato yellow leaf curl virus, tobacco mosaic virus, and cucumber mosaic virus in the sources, and a variety of virus diseases may occur in the field due to mixed infection by several kinds of 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 squash, 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 rapid onset and rapid spread. Once it is onset, if it is not timely and reasonably controlled, it can be expanded to a full shed in a short period of time. Attention should be paid to air release, temperature control and humidity control to avoid dew condensation or water film formation; avoid watery days after rainy weather, control the watering after onset; 72% frosty urea manganese zinc wettable powder is used for diseased plants, 68% Fine Aloes Manganese Zinc Water Dispersible Granules, 52.5% Terconazole Clomazone Urea Cyanide Water Dispersible Granules, 25% Azoxystrobin Suspension, Pythium oligospirillum 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
Severe disease can cause dry leaves and reduce yield. Should be reasonable temperature and humidity control, to avoid rainy days after rainy days, after the onset of appropriate control of watering; 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.