Recently, there have been problems with vegetable farmers consulting tomato leaf curling. Tomato leaf rolling is just the external manifestation of illness, and it is the physiological response of crops to coping with adverse environmental or biological hazards. The causes of the disease and its treatment methods are described below:
High-temperature leaf-rolled tomatoes will grow slowly when the temperature is higher than 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.
The optimum temperature for the growth of low-temperature leaf-rolled tomatoes is 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.
The fertilization scheme for fertilizing the excessively burnt leaf is based on the target yield of the tomato, and the amount of one flush for 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.
The symptoms of tomato plant infected with leaf virus infected by leaf virus infected by leaf wounds were first observed in different degrees of dwarfing, and all or part of the leaf blades curled upwards from top to 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.
The herbicides applied to the corn fields adjacent to the weeds in the vicinity of the wounds of the herbicides can easily drift along with the air flow, causing phytotoxicity to the surrounding tomato plants, causing the tomato leaves to roll up and become stiff and brittle.
Treatment measures: General symptoms of rolling leaves can be sprayed with gibberellin 4000 times to relieve symptoms, you can also spray Bihu 5000 times to promote leaf rolling. At the same time strengthen the cultivating fertilization to promote plant growth, the rescue effect will be better.

Cixi Air-Fluid Teflon Washer Fitting is a new featured products introduced by Cixi Air Fluid Company ,which can be interchanged with BSPP ,BSPT & NPT Threads ,Non Leakage.

Teflon Washer Metal Push in Fittings

Teflon Washer Metal Push In Fittings, Pneumatic Metal Teflon Washer, Teflon Washer Metal

Ningbo Air-Fluid Pneumatic Components Co., Ltd , https://www.air-fittings.com