Virus infected leaf roll
Symptoms of tomato plants infected with fern leaf viral disease are different degrees of dwarfing, and all or part of the leaves appear upwardly curled from the top to the bottom.
Treatment measures: Spray 25% Aktai water dispersible granules 2500-5000 times, 24.7% Arica microcapsule suspension 3000 times, 20% virus A wettable powder 500 times, 1.5% Ling EC 1000 times and so on.
Hot rolled leaf
Tomatoes grow slowly at temperatures above 30°C, increasing photorespiration and affecting nutrient accumulation. For temperatures above 35°C, the water transpiration of the plant leaves was accelerated, and the water transport speed in the root could not keep up with the transpiration rate of the leaves, which could easily cause dehydration on the surface of the leaves.
Remedy measures: To produce tomatoes in the protected areas, shade nets should be added in time to increase the ventilation openings in the greenhouses, and be careful not to remove the insect nets. Spraying 600 times liquid Bi care can ease leaf rolling disorders.
Cold roll leaf
Appropriate temperature requirements for tomato growth are that the daytime temperature is maintained at about 25°C and the night temperature is 16°C to 18°C. The critical point for stopping the growth is 10°C. Below a temperature of less than 10°C, the mesophyll cells will be chilled and the leaves will bend downwards until the mesophyll cells freeze and whiten.
Treatment measures: Tomatoes are produced in protected areas in the cold season. When the greenhouse temperature is insufficient to ensure the tomato growth requirements, it is recommended to add geothermal heating or temporarily increase the temperature of the fire to promote growth. At the same time spraying 7500 times liquid Bi conservation, combined with spray water for 1 or 2 times foliar spray fertilizer. When leaves are yellow, foliar fertilizers such as Yelvbao, Gumi Green and Ruipei Green can be sprayed and used for conditioning.
Herbicide Damage Roll
Closed herbicides applied to the corn fields in the adjacent plots can easily drift along with the airflow, causing phytotoxicity to the surrounding tomato plants, causing the tomato leaves to roll up, stiff and brittle.
Rescue measures: Generally, the symptoms of leaf curling can be sprayed with Bijing 5000 times to promote the rolling leaves. At the same time strengthen the cultivating fertilization to promote plant growth, the rescue effect will be better.
Red fertilization with excessive burning leaves
The fertilization plan is based on the target yield of the tomato, and the amount of flushed fertilization should be determined by the current number of ears. Some growers always think that applying more fertilizer will have a higher yield, but they don't know that excessive fertilization will cause excessive local fertilizer concentration in the soil, resulting in root burns and leaf margin leaf spotting.
Treatment measures: Rational fertilization, control of water and fertilizer applied in flushing are important measures to reduce the damage.
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