The individuals of the tea plant are very small and difficult to detect with the naked eye. Moreover, the symptoms of the tea plant infestation are similar to those caused by hormonal intoxication. Therefore, many vegetable growers cannot distinguish correctly, resulting in non-compliance of medicine and prevention of timely treatment. Symptoms of hormonal intoxication are that the leaves are curled up and stiff, and the veins are heavy. Generally, they are expressed on the leaves of weak plants in the shed, and the color of the hormone-poisoned leaves does not change when they shrink and curl. When the tea plant was damaged, the edges of the plant leaves curled downwards, narrowing and becoming smaller, and the back of the leaves appeared gray-brown.
When the temperature in the shed is 22°C~28°C and the relative humidity is above 80%, it is easy to cause the damage of the tea plant. Therefore, the management should pay attention to the timely ventilation, covering the mulch, pouring water under the film, and laying stalks between the gullies. Measures to reduce the humidity in the booth.
The key to the control of tea-resistance is to spray the leaves on the back of the leaves and completely kill the eggs and larvae on the back of the leaves. The effect of spraying on the front is not good. It is recommended that vegetable farmers use avermectin mixed with 20% zearalac WP 3000 times solution or 73% chloranthenite 2,000 times solution for better control.
When the temperature in the shed is 22°C~28°C and the relative humidity is above 80%, it is easy to cause the damage of the tea plant. Therefore, the management should pay attention to the timely ventilation, covering the mulch, pouring water under the film, and laying stalks between the gullies. Measures to reduce the humidity in the booth.
The key to the control of tea-resistance is to spray the leaves on the back of the leaves and completely kill the eggs and larvae on the back of the leaves. The effect of spraying on the front is not good. It is recommended that vegetable farmers use avermectin mixed with 20% zearalac WP 3000 times solution or 73% chloranthenite 2,000 times solution for better control.
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