During the growth of tomato, sometimes the upper and lower leaves of the plant appear to be rolled up into a tube or semi-cylindrical phenomenon. The reasons may have 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.
The first prevention and control measures are to strengthen the tomato disease, especially the early prevention and treatment of viral diseases, select virus or Yufeng 18 plus the appropriate amount of humic acid or amino acid foliar fertilizer spray, 7 to 10 days once, and 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 maintain a certain amount of moisture, especially in the seedling stage, to meet the needs of plant growth and moisture. Spread 3~5 cm thick shredded wheatgrass between the rows. At the same time, the ground temperature should be kept as high as 5°C to ensure Root normal physiological activity.
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