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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 activity, meaning it works primarily on the pests it comes into direct contact with. This makes it highly effective against spider mites, thrips, and other soft-bodied pests. It is commonly used to control lepidopteran pests such as the cabbage butterfly (*Pieris rapae*) and the diamondback moth (*Plutella xylostella*), and is suitable for use in vegetables, fruit trees, and other crops.
When applying beta-cypermethrin, it is usually sprayed directly onto the affected areas. The recommended dosage depends on the formulation. For example, a 4.5% emulsifiable concentrate is typically diluted at a ratio of 1,500 to 2,000 times, while a 10% emulsifiable oil should be diluted between 3,000 and 4,000 times. The best time to apply it is during the early stages of pest infestation when the population is still low.
Here are some specific application guidelines:
1. **Cotton aphids and thrips**: When bud damage reaches 30% or leaf curling reaches 5%, apply 30–50 ml of 4.5% emulsifiable concentrate per acre mixed with 40–50 liters of water.
2. **Cabbage caterpillar and small cabbage worm**: During the second or third instar stage, use 20–40 ml of 4.5% emulsifiable concentrate per acre, mixed with 40–50 liters of water.
3. **Rapeseed aphids**: Apply 20–30 ml of 4.5% emulsifiable concentrate per acre, mixed with 40–50 liters of water, during the peak period of wingless aphid occurrence.
4. **Citrus leaf mites**: Spray during the early shoot growth stage or when eggs begin to hatch. Dilute 2250–3000 times with 4.5% emulsifiable concentrate and water.
5. **Citrus red scale**: Apply during the egg-hatching period. Use 4.5% emulsifiable concentrate diluted 900 times with water.
6. **Tea geometrid (tea ruler)**: Apply during the prolonged larval stage of the second- to third-instar. Use 25–40 ml of 4.5% emulsifiable concentrate per acre, mixed with 60–75 liters of water.
**Precautions**:
- Beta-cypermethrin should not be mixed with alkaline pesticides, as this can reduce its effectiveness.
- The product is flammable, so storage and transportation must follow strict fire safety guidelines.
- It is toxic to livestock, fish, and bees, so care should be taken to avoid contamination of water sources and non-target areas.
Always read and follow the label instructions carefully before use, and wear appropriate protective equipment when handling the pesticide. Proper application ensures both effective pest control and environmental safety.