Causes of blade curling 1. Topping and pruning prematurely. Too early picking tends to breed axillary buds. Phosphoric acid in the leaves has no place to transport, resulting in aging of the leaves and massive curling. 2. High temperature and drought. After entering the end of the result, it encountered high temperature and dry weather and could not make up the water in time. At this time, the leaf area was large. High temperature and strong light enhanced the transpiration of the leaves, and the lower leaves of the plants were prone to curling. In the cultivation of greenhouses, it is often more prone to occur in the middle and late stages of growth, especially at the vents. 3. Improper fertilization. Excessive application of nitrogen fertilizer can cause leaflets to turn over and curl; severe phosphorus deficiency, potassium deficiency, and lack of calcium, boron and other trace elements can cause leaf stiffness, curled leaf margins, or small and deformed leaves. 4. Caused by a viral disease. Tomatoes are prone to viral disease, resulting in chlorotic leaves, smaller leaves, and leaf shrinkage. Leaf curling, mostly manifested in the heart and upper leaves, prone to occur under high temperature and strong light. 5.2.4-D phytotoxicity. When 2.4-D flowering is used during flowering, excessive concentration or sprinkling on the leaves will cause curling. In addition, spring is cultivated in the field, and 2.4-D butyl ester is sprayed on the surrounding wheat fields to prevent weeds in the wheat field. The floating of the liquid medicine is also likely to cause phytotoxicity, leading to deformed leaf blade curling.
Control methods 1. Strengthen fertilizer and water management. Increase the use of mature, high-quality farmyard fertilizers to prevent overexposure to nitrogen and balanced fertilization. Avoid over-drought. Don't flood with water after drought. Pay special attention to not being able to water at high temperature at noon. Because the ground temperature drops suddenly after watering, the root system cannot adapt to abrupt changes, water absorption is inhibited, and physiological drought is aggravated. 2. Strengthen the cultivation and management of greenhouses. According to the growth and development of tomatoes, regulate the temperature and humidity, especially in the late growth period to keep the soil moist, the shed can not be too dry. 3. Use anti-virus disease varieties. Timely prevention and control of aphids, cut off the route of transmission. When viral disease occurs, medication is used for prevention and treatment. 4. Do not use excessive concentration when using 2.4-D. Be careful not to spill liquid on the leaves, or use “Tomato Spirit†to decorate. 5. Take heart and pruning timely. Topping and collateral shaping should be based on the growth of the plant and maintain a reasonable leaf area, both to control the prosperous, but also to prevent premature aging.
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