The problem of tomato leaf curling is a common problem for farmers. Especially late autumn cultivation of tomatoes. During the growth of tomato plants, sometimes the upper and middle leaves of the plant appear to be rolled up into a cylindrical or semi-cylindrical appearance. The reasons include the following four aspects: First, the virus infection; Second, the lack of trace elements in the soil to supplement, such as manganese, iron and other trace elements; Third, pruning overweight, leaves fewer plants to retain; Fourth, soil drought or ground temperature Too low, the water absorption capacity of the root is weak, resulting in imbalance of transpiration and water absorption, and induce leaf curling.
In the prevention and control measures, we should grasp the following comprehensive measures: First, to strengthen the tomato disease, especially the early prevention and treatment of viral diseases, select the virus or Yufeng 18 appropriate amount of humic acid or amino acid foliar fertilizer spray, 7 to 10 days, even Spray 2 or 3 times to cultivate strong seedlings. The second is to pay attention to fertilizer with a reasonable mix, use multi-element micro-fertilizer mixed with other fertilizers. The third is to remove the sprouts on the tomato vines in time, pick them up early, and pruning can not be too heavy to minimize the wound surface. Fourth, the soil should be contrived to maintain a certain amount of moisture, especially at the seedling stage, to meet the needs of plant growth and moisture. Spread 3~5 cm thick crushed wheatgrass between rows, and keep the ground temperature at 5°C or more. To ensure the normal physiological activity of the root system.
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