Second, 2.4? D and other hormonal phytotoxic 2.4? D phytotoxicity symptoms are bent leaves or growth points, the new leaves can not be normal expansion, leaf edge distortion, stem bulge, lighter color. Other hormonal agents such as chlormequat and anti-dropping agents are less harmful than 2,4?D. Prevention measures: The hormone concentration of medium-maturing varieties should be 20PPM, the early-maturing variety is 15PPM, and the concentration should be lower when the temperature is high. When using, take care to prevent it from being touched by young leaves or growing points. Never spray it. After the occurrence of phytotoxicity, some chemical fertilizers can be promoted, such as Oppor, natural brassin and so on. The area where the phytotoxicity occurs is large and there is no disease center, which is different from other diseases.
Third, the physiological leaf before and after the harvest of the tomato, the first ear leaves a little roll, or the entire leaf curled into a tube, become brittle. The reason is that due to the high temperature and drought, the stomata of the tomato are closed, causing the leaves to curl. Preventive measures: Drought-proof exercise before planting until fruit setting. After setting fruit, water and fertilize timely and covered with shading net. On sunny days, cover during the day and exposing at night. Cloudy weather does not cover.
Fourth, the main symptoms of Tea Harm caused damage to the narrowing of the leaves, stiffness, erection, shrinkage or distortion, and finally baldness. It is hard to identify with the naked eye. The control agent can be used 15% fluorenone 3000 times, 1.8% efford 3000 times or 73% gefilte 2000 times.
Fifth, the cold weather invaded the shed indoor ventilation, outdoor cold air exchange with the indoor warm air, can easily cause the tomato leaves near the vent curl. Under normal circumstances, as long as the wind is gradually released, this problem will not arise.
Sixth, lack of phosphorus deficiency symptoms showed purple back, brown spots appear on the leaves, the lower leaves rolled up, the old leaves turn yellow, dark brown leaves dead. In general, the low temperature during seedling stage will affect the absorption of phosphorus, soil acidity or compaction is also easy to lack of phosphorus, can be solved by applying soil phosphate fertilizer or spraying 0.3% potassium dihydrogen phosphate. Magnesium deficiency showed that in the first greenhouse expansion, the old leaves in the lower part of the plant were chlorotic, yellowing appeared between the veins, and then expanded upwards to form yellow variegated leaves. In severe cases, the leaves are stiff or rolled on the edges, and there are necrotic spots or brown bands between veins. This can be solved by applying a full-element fertilizer or a foliar spray of magnesium sulfate 50 to 100 times.
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