Question: The tomato leaves are yellow and there is a large area of ​​leaf curling. What are the reasons and how do we control it? Answer: Regardless of greenhouse tomato or open-to-ground tomato, it is prone to leaf curling with different symptoms under high temperature and drought conditions. It is important to understand the causes of these leaf curling symptoms and do preventive work. Physiological roll control measures are timely watering and fertilization after fruit set, covering the shade net, cover during sunny day and night, exposing at night, and not covering cloudy days. Symptoms of tea aphid infestation were narrowing of leaves, stiffness, erection, shrinkage or distortion, and finally, a tip of a baldness. The control agent can be sprayed with 1.8% afordin 3000 times solution. Hormonal injury In the use of plant hormones to prevent flowering and fruit drop, leaves or growth points will appear bent, the new leaves can not be normal, the control measures for the use of the appropriate concentration, the general use of 15 to 20 mg / kg concentration, when the temperature is high The concentration is lower. When using, be careful not to spray the liquid onto the leaves or growing points. Do not spray it. Industrial Nitrile Gloves,Nitrile Gloves Extra Large,Nitrile Powder Free Glove,Nitrile Powder Disposable Examination Gloves Jiangsu Yanfang Medical Technology Co.,Ltd. , https://www.yanfangmedical.com