Sunyuelou, Zhangwu Village, Yangji County, Suining County, said on May 9 that the tomatoes in his greenhouse had been damaged when the wind blows on April 25th. Considering that the temperature is already high, there is no further cover film. Now Two or three leaves at the base have a curled edge to the foliage. He asked what was the reason. According to the enquiry, the second inflorescence of tomato has bloomed and water was poured one week ago. At present, there are no other symptoms except the leaf curl.
According to analysis, the tomato is likely to be a physiological leaf. The symptoms are mainly the longitudinal roll up of the leaves. The degree of severity of leaf rolling varies greatly. From the perspective of the whole plant, only the lower or middle and lower leaves curl; some of the entire leaves are curled. When the leaf roll is severe, the leaves become thick and brittle and have an impact on the yield. Tomato leaf rolling occurred before or during fruit harvesting.
There are many causes of physiological leaf curling in tomato, which needs to be analyzed specifically according to specific conditions. There are mainly the following reasons: (1) The soil is dry, or the root system is poorly developed, damaged, and the water absorption capacity is weak. In high temperature plants, the leaf transpiration is large and the water loss is high. In order to reduce the loss of water, the plant leaves curl, which is a physiological protection phenomenon. There is also a phenomenon of leaf rolling in the tomato production in the greenhouse. (2) Excessive partial application of nitrogen fertilizers, especially trace elements such as iron and manganese in soil, will also cause leaf rolling. This leaf is often accompanied by yellowing and purple leaves. (3) Plant pruning, snoring, premature topping, and excessive weight, phosphorus absorbed by the roots have no place to transport, will accumulate in the lower leaves, making it hardened and curled.
Combined with the situation reflected by Sun Wanlou, tomato leaf curls may be related to the premature destruction of the shed film. The tomato was originally grown in a shed with relatively stable temperature and humidity. After the shed film was damaged, the tomato was grown in an open field environment. When the tomato was exposed to high temperature and dry heat, the water in the plant was physiologically deficient, so the leaf rolling phenomenon occurred. Through timely irrigation, strengthen management to improve the resilience of tomatoes, can ease the symptoms.