Tomato cracking stems, also known as tomato "roof" stems, affect plant growth, plants easily break from the cracking. Tomatoes in protected areas and protected areas have occurred, mainly in tomatoes during the high temperature period. Mostly in the 20th to 30th days after colonization, it occurred near the third panicle. At the beginning, the necrosis of any part of the stem becomes brown, and the stem is abnormal after 7 to 14 days. There is a longitudinal groove depression between the nodes and a hole is gradually formed. When light, only longitudinal grooves or linear, "Y" shaped gaps are formed. In severe cases, the longitudinal groove is deeply hollowed into a hole, and penetrates the stem to form a hollow, resembling a “skylightâ€. The symptoms not only appear on the main branch, but also occur on the axillary bud. Once the fissure stems occur, the internodes at the site of occurrence are significantly shortened. The leaves are opposite and the ear is weak, often with poor fruit. The prevention and control measures are rational use of fertilizers, combined application of nitrogen, phosphorus, and potassium fertilizers. Special care must be taken to avoid excessive nitrogen fertilizers. Pay attention to the application of calcium and boron trace elements. It was found that the soil should be watered in time, but avoid flooding. When using greenhouses to cultivate tomato more summer, it is best to use the old plastic film to shading and cooling the cover, do not use black shading nets. When a split stem occurs, the lateral branch can be used instead of the main branch. Insulin Syringes Needle,Disable Syringe,Monoject Syringe,10 Ml Syringe FOSHAN PHARMA CO., LTD. , https://www.full-pharma.com
The etiology is mainly due to the survival of tomatoes after colonization, due to high temperature, excessive water control, excessive nitrogen fertilizer inhibits the absorption of calcium and boron, resulting in young growth point damage or stem injury.