In recent years, the phenomenon of leaf rolling in greenhouses has occurred frequently. The reason for the analysis is that it has a great relationship with the physiological barriers of plants and the influence of external environmental conditions. It not only affects the photosynthesis of plants, but also hinders the synthesis of nutrients and interferes with the normal development of plants. And growth can also seriously affect its quality and yield. According to the investigation of tomato leaf rolling, there are several reasons to prevent it:
1. Wind and cold invasion. This kind of situation occurs mostly in the early stage of seedling and blasting. Generally, it starts to roll from the tip of the leaf, and the blade is chicken-claw. In severe cases, the dry tip has white edges. The main reason is that the wind is violent, and the plants are exposed to low temperature and dry air. The prevention and treatment method is: pay attention to the external climatic conditions when releasing the wind, adopt a step-by-step method, immediately close the tuyere when the leaf is rolled, raise the temperature, and spray the warm water to the plant in time to make it recover naturally.
2. Infected with a viral disease. Viral diseases occur mostly in the seedling stage and adult stage. After the onset, the leaves of the plants are curled, shrinking and shrinking, and when they are severe, they become tubular, and the plants grow or stop growing. The control method is: soaking seeds with 10% trisodium phosphate solution for 30 minutes before sowing; killing the cockroach early and destroying the transmission medium; spraying the virus A or phytopathetic once every 7-10 days after the planting.
3. Improper use of hormones. If the plant hormone is used incorrectly during the flowering period of the tomato, or if the concentration of 2,4-D is increased at will, or if the sprayer with residual herbicide is misused when spraying the pesticide, the tomato leaf will be caused. In order to prevent such a situation from happening, the concentration used should be properly controlled according to the weather conditions.
4. The whole branch is overweight. Plants retain less leaves, and excess fertilizer can cause most of the leaves of the whole plant to roll up and become severely rolled into a tube. In the expansion period of the fruit, there are also phenomena in which the leaves are rolled upwards. Control method: rational fertilization, proper amount of watering, timely tillage. Remove the sprouted branches of the tomato vines in time, pick them up early, and pick them up too much, and try to reduce the wound surface.
5. Rolled leaves caused by sassafras. Tea jaundice sucks juice in leaves or young organs, causing plant or fruit malformation, narrowing, thickening, stiffness or distortion of the leaves. Control measures: remove weeds and fallen leaves. It is best to smoke the shed before the seedlings, eliminate the eggs, and do a good job in chemical control.
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