In the process of tomato production, plants are wilted due to wilt disease, bacterial wilt and physiological water shortages, and measures should be taken to prevent and remedy them.
The phenomenon of hollow stems and wilting of tomato stems due to physiological water shortage occurs mostly in the cold season, which is mainly caused by poor root growth. The optimum soil temperature for tomato root growth is 20～22°C. The root hairs stop growing when the temperature is 9～10°C. When the soil temperature drops to 5°C, the ability of the root to absorb water and nutrients is hindered. If it is fine at this time, the temperature of the greenhouse rapidly increases, and the root system However, it is difficult to absorb water quickly, causing the plants to wilt. Usually the temperature rises steadily, and the symptoms will be relieved when the roots return to normal.
The wilting caused by wilt disease and bacterial wilt is different, which often brings great harm to tomato production. The main difference between the two is that: First, different bacteria, bacterial wilt is a bacterial disease, and blight is a fungal disease. Second, the onset of growth is different, and bacterial wilt begins to occur at a plant height of 30 cm. Fusarium wilt generally begins to occur at the flowering stage. Third, the phenomenon of wilting is different. The wilt disease strains are wilted during the day and recover in the evening, while the wilt disease strains are wilted during the day and do not recover in the evening. Fourth, the disease course is different. The course of bacterial wilt disease progresses rapidly. Severe diseased plants die after 7 to 8 days, while the disease progression of the wilt disease is slow. The diseased plants generally have to die after 15 to 30 days. Fifth, the leaves remained green after the wilt diseased plants died, and the leaf color turned yellow after the wilt diseased plants died. Sixthly, the cross-cut stems were squeezed or moisturized. The section of the bacterial wilt disease strain overflowed the white fungus, whereas the wilt disease-free strain did not.
The main measures to prevent the hollow and wilting of the stems of tomato stems are as follows: (1) When growing tomatoes in winter and spring, care should be taken to protect and promote the growth of roots. Main measures: Intensifying heat preservation; Applying nitrogenous fertilizers without applying partial fertilizers; Apply foliar fertilizers rich in trace elements; Applying root-reducing agents; After the rainy days or when the light is strong, cover should be gradually removed. (2) Strengthen disease monitoring, early prevention and early treatment. Bacterial wilt can be used 6% kasugamycin wettable powder 300 to 400 times, or 72% agricultural streptomycin sulfate wettable powder 500 times, or Prec 72.2% propamocarb hydrochloride salt water 800 to 1000 times etc. Irrigation control. Fusarium wilt can be treated with 50% thiophanate-methyl WP and 800-1000 times solution.
Vibrators For Women,Vibrator Dildo Vibrator For Women,Rabbit Vibrator Women,Vibrator Massager Adults
Shenzhen Dongchen Hey E-commerce Co.,Ltd. , https://www.xxsexytoy.com