Shelving phenomenon often occurs in greenhouses. After investigation, it has a direct relationship with the physiological barriers of plants and the impact of external environmental conditions, reminding farmers to be prevented as soon as possible.
First, cold wind attack caused by leaf curl
In the initial stage of nursery and exhalation, generally the leaf tip begins to roll over, and the leaves are chicken-like. In severe cases, the dry tip has white edges. This is due to the violent release of the air, the plant's sudden encounter with low temperatures and dry air. Countermeasures: When venting, pay attention to the outside weather conditions, adopt a gradual approach, and immediately turn off the tuyere when the leaves are found, raise the temperature, and spray the plants with warm water in time to restore them naturally.
Second, infected virus disease caused by leaf rolling
Virus disease mostly occurs in the seedling stage and adult plant stage. After the onset of disease, the leaves of plants curl, shrinkage becomes smaller, and when serious, they are tubular, and the plants cluster or stop growing. Countermeasures: soaking seeds with 10% trisodium phosphate solution for 30 minutes before sowing; killing worms early and eradicating the virus transmission medium; spraying virus A or controlling disease and disease every 7-10 days after planting.
Third, hormone injury caused by leaf rolling
In the flowering period of tomato, if the plant hormone is misused or the concentration of 2,4-D is arbitrarily increased, or if the sprayer containing the residual herbicide is misused when pesticide is sprayed, tomato curling will be caused. Countermeasures: The use of hormones should be reasonably determined according to the weather conditions.
Fourth, pruning tossing caused by heavy leaf
The few leaves reserved by the plants, and the surplus of fertilizer and water will cause most of the leaves of the whole plant to roll up and become severely rolled into a tube. Some fruit in the fruit enlargement period, there is also a phenomenon of upward rewinding leaves. Countermeasures: Rational fertilization, adequate watering. Immediately remove the germinating branch of the tomato vine, pruning can not be too heavy, to minimize the wound surface.
V. Tea damage caused by yellow tea leaves
Camellia sinensis sucks sap in the leaves or young organs, resulting in malformation of the plant or fruit, narrowing of the leaves, thickening, stiffness or distortion. Countermeasure: Remove weeds and fallen leaves. It is better to smoke the shed before the seedlings to destroy the eggs and do a good job of chemical control.
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