Bifenthrin, commonly known as Uranus or insecticide, is a widely used pesticide that many people may not realize is the same substance. If you're wondering about its toxicity, target pests, and how it differs from other pesticides like fenvalerate, fipronil, or chlorfenapyr, here's a detailed overview.
**Introduction to Bifenthrin**
Bifenthrin is also referred to as Uranus, and it's effective against a variety of insects such as cockroaches, whiteflies, and aphids. It comes in formulations like 2.5% and 10% emulsifiable concentrate. In terms of toxicity, it is considered moderately toxic to humans and animals but highly toxic to aquatic life, especially fish.
The acute oral LD50 for rats is 54.5 mg/kg, while the dermal LD50 for rabbits is over 2000 mg/kg. It does not cause skin or eye irritation and has no mutagenic, carcinogenic, or teratogenic effects. Birds are relatively safe, with an LD50 of 1800 mg/kg for birds and 4450 mg/kg for wild ducks.
**Insecticidal Properties and Target Pests**
As a pyrethroid insecticide, bifenthrin works through contact and stomach action, without systemic or fumigant properties. It’s effective against a wide range of pests, including caterpillars, whiteflies, aphids, and leafhoppers. It acts quickly, has a long residual effect, and is environmentally safer due to low mobility in soil.
**Crops Treated**
Bifenthrin is suitable for use on various crops, including bananas, barley, cotton, lettuce, apples, tomatoes, green beans, grapes, peanuts, watermelons, and many more.
**Application Methods**
- **Whiteflies**: Apply 2.5% Uranus EC diluted 2000–2500 times when populations are low (about 2 per plant). For severe infestations, mix with 25% chlorpyrifos WP at 1500 times.
- **Aphids**: Use 2.5% Uranus EC diluted 2500–3000 times at the early stage. The residual effect lasts around 15 days.
- **Red Spider Mites**: Spray 2.5% Uranus EC diluted 2000 times during the active growth phase to control within 10 days.
**Environmental Impact**
Although bifenthrin is moderately toxic to humans and animals, it is very toxic to fish, with LC50 values of 0.00015 mg/L for rainbow trout and 0.00016 mg/L for leeches. Its low water solubility and high soil affinity reduce environmental impact. However, it is moderately toxic to bees and highly toxic to silkworms.
This makes bifenthrin a powerful yet carefully managed tool in pest control, ideal for both agricultural and household use. Always follow label instructions and safety precautions when handling this pesticide.
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