Tomato leaf rolling analysis

In recent years, the phenomenon of leaf curling in greenhouses has occurred from time to time. The reason of the analysis is related to the physiological barriers of plants and the influence of external environmental conditions. It not only affects the photosynthesis of plants, hinders the synthesis of nutrients, and interferes with the normal development of plants. And growth, but also seriously affect its quality and yield. According to the survey, there are mainly the following reasons for the leaf curling of the tomatoes. The vegetable farmers must do preventive work.

One, due to cold winds

This kind of situation occurs in the initial stage of nursery and exhalation. Generally, it starts from the tip of the leaf and rolls up. The leaves are chicken-like. In severe cases, the dry tip has white edges. The main reason for this was the violent release of the air and the plant's sudden encounter with cold and dry air. Control methods: Pay attention to the external climatic conditions when venting, and adopt a gradual approach. When the leaf is found, immediately close the tuyere, increase the temperature, and spray the plants with warm water in time to restore it naturally.

Second, caused by infectious diseases

Virus disease mostly occurs in the seedling stage and the adult plant stage. After the onset of disease, the plant leaves curl, shrinkage becomes smaller, and when serious, it becomes a tube, and the plants cluster or stop growing. Control methods: Before sowing, use 10% trisodium phosphate solution to soak seeds for 30 minutes; eliminate worms early and eradicate the transmission medium; spray and apply virus A or phytosanitary spirit every 7-10 days after planting.

Third, due to injury caused by drugs

In the flowering period of tomato, if the phytohormone is misused or the use concentration of 2,4-D butyl ester is arbitrarily increased, or the sprayer containing the residual herbicide is misused when pesticide is sprayed, tomato curling may also be caused. Control methods: According to the weather conditions, a reasonable understanding of the use of pharmaceutical concentrations.

Fourth, due to improper management

Pruning too much weight, leaving few leaves on the plant, and excessive fertilizer and water will cause most of the leaves of the whole plant to roll up and become severely tube-shaped. Some fruit in the fruit enlargement period, there is also a phenomenon of upward rewinding leaves. Control methods: pay attention to reasonable fertilization, adequate watering, and timely cultivating. Immediately remove the sprouts on the tomato vines, pick early picking small, pruning can not be too heavy to minimize the wound surface.

V. Caused by tea damage

Camellia sinensis sucks sap in the leaves or young organs, resulting in malformation of the plant or fruit, narrowing of the leaves, thickening, stiffness or distortion. Prevention methods: removal of weeds and leaves, it is best to do pre-emergence smoke Smoking shed, eliminate eggs, and do a good job of chemical control.

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