The spirit and each of the methadone and halothin are broad-spectrum insecticides and are chemically classified as carbamates. The agent has high solubility in water, but it is easily solved under alkaline conditions or in moist soil, so it will not persist in the environment. It has high oral toxicity to humans and animals, but it has low transdermal toxicity. It is safe for bees and pests, and it is highly toxic to fish. Wanling has insect absorption, contact killing, and stomach poisoning effects on insect pests. It also kills some lepidopteran pests. The insecticidal spectrum is wide, and the poisonous effect is rapid. Usually, it can be effective after spraying for 1 hour, and the maximum effect is achieved in 2 days, but the effective period is short, generally 3-4 days. Because it decomposes quickly, it has a low residual amount in tea leaves. The safety interval is 7 days.
At present, Wan Ling preparations mainly have 90% wettable powders. 24% water and 20% EC are mainly used in tea gardens to prevent and control pests such as the small green leafhopper, black locust, and thrips. The results of multiple experiments over the years have shown that 90% of wettable powders can be used to prevent and control false eye leafhoppers. When the dose is 18.75-25 g/mu, the control effect is as high as 90% or more: 24% Wan Ling Shui agent is used for prevention and control. When the dose of the small green leafhopper was 94-160 ml/mu, the control effect was above 90%.
In addition, it is necessary to pay attention to the appropriate period of control when using Wanling to prevent pests in tea gardens. Generally, the appropriate period of prevention and treatment of false-eye small green leafhopper and tea-white thrips was at the peak of nymphs, and the appropriate period of prevention and control of black-horned whitefly was at the end of egg incubation. If it is used in combination with a drug with a longer potency to extend the residual period, the pest can be controlled more effectively. However, it should be noted that the drug cannot be mixed with alkaline chemicals and pesticides containing iron and tin.
At present, Wan Ling preparations mainly have 90% wettable powders. 24% water and 20% EC are mainly used in tea gardens to prevent and control pests such as the small green leafhopper, black locust, and thrips. The results of multiple experiments over the years have shown that 90% of wettable powders can be used to prevent and control false eye leafhoppers. When the dose is 18.75-25 g/mu, the control effect is as high as 90% or more: 24% Wan Ling Shui agent is used for prevention and control. When the dose of the small green leafhopper was 94-160 ml/mu, the control effect was above 90%.
In addition, it is necessary to pay attention to the appropriate period of control when using Wanling to prevent pests in tea gardens. Generally, the appropriate period of prevention and treatment of false-eye small green leafhopper and tea-white thrips was at the peak of nymphs, and the appropriate period of prevention and control of black-horned whitefly was at the end of egg incubation. If it is used in combination with a drug with a longer potency to extend the residual period, the pest can be controlled more effectively. However, it should be noted that the drug cannot be mixed with alkaline chemicals and pesticides containing iron and tin.
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