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How to use beta-cypermethrin correctly?
Beta-cypermethrin is a synthetic pyrethroid insecticide known for its strong contact and stomach toxicity. It does not have systemic properties, meaning it works primarily on the pests it comes into direct contact with. This compound is effective in quickly knocking down pests and provides good control over spider mites and thrips. It is commonly used to manage lepidopteran pests such as the cabbage white butterfly (*Pieris rapae*) and the diamondback moth (*Plutella xylostella*). It is suitable for use in vegetable crops, fruit trees, and other agricultural settings.
When applying beta-cypermethrin, it is typically done through foliar spraying. The recommended dosage varies depending on the formulation. For example, 4.5% or 5% emulsifiable concentrates are usually diluted at a ratio of 1,500 to 2,000 times. Alternatively, 10% emulsifiable oil can be diluted at 3,000 to 4,000 times. It is best to apply the product during the early stages of pest infestation for maximum effectiveness.
Here are some specific application guidelines:
1. **Cotton aphids and thrips**: When the bud damage rate reaches 30% or the leaf curling rate is 5%, apply 30–50 ml of 4.5% emulsifiable concentrate per acre mixed with 40–50 kg of water and spray evenly.
2. **Cabbage caterpillar and small cabbage worm**: For larvae in the second or third instar stage, use 20–40 ml of 4.5% emulsifiable concentrate per acre, mixed with 40–50 kg of water, and spray thoroughly.
3. **Rapeseed aphids**: During the peak period of wingless aphid occurrence, apply 20–30 ml of 4.5% emulsifiable concentrate per acre, mixed with 40–50 kg of water, and spray evenly.
4. **Citrus leaf mites**: Apply during the early shoot growth stage or when eggs are hatching. Dilute 2,250–3,000 times with 4.5% emulsifiable concentrate and spray evenly.
5. **Citrus red scale mites**: Spray during the egg-hatching period. Dilute 900 times with 4.5% emulsifiable concentrate and water, then apply evenly.
6. **Tea geometrid (tea ruler)**: During the prolonged larval stage (second or third instar), use 25–40 ml of 4.5% emulsifiable concentrate per acre, mixed with 60–75 kg of water, and spray thoroughly.
**Precautions**:
- Beta-cypermethrin should not be mixed with alkaline pesticides, as this may reduce its efficacy.
- The product is flammable, so storage and transportation must be done away from heat sources and open flames.
- It is toxic to livestock, fish, and bees, so care should be taken when spraying to avoid contamination of water sources or non-target areas.
Always follow the manufacturer’s instructions and local regulations when using any pesticide to ensure safety and environmental protection.