Chlorpyrifos
Chlorpyrifos is a highly effective organophosphate insecticide widely used in agricultural and residential settings. With its broad-spectrum control capabilities, Chlorpyrifos targets numerous pests while protecting crops and structures.
Key Product Specifications
- Chemical Name: O,O-diethyl O-(3,5,6-trichloro-2-pyridyl) phosphorothioate
- CAS Number: 2921-88-2
- Molecular Formula: C9H11Cl3NO3PS
- Appearance: Colorless to white crystalline solid
- Odor: Mild mercaptan (similar to garlic)
Technical Parameters
| Parameter | Specification |
|---|---|
| Purity | ≥95% (technical grade) |
| Melting Point | 42-43.5°C |
| Vapor Pressure | 2.7 mPa at 25°C |
| Solubility in Water | 1.4 mg/L at 25°C |
| Half-life in Soil | 10-120 days (varies by conditions) |
| Formulations Available | EC, WP, G, GR, SC |
Chlorpyrifos FAQ Section
Q: What pests does Chlorpyrifos effectively control?
A: Chlorpyrifos demonstrates excellent efficacy against a wide range of pests including termites, cockroaches, fire ants, cutworms, corn rootworms, grubs, and many beetle species. In agricultural applications, it controls pests in crops like corn, soybeans, fruit trees, and vegetables. The insecticide works by inhibiting acetylcholinesterase, an enzyme essential for proper nervous system function in insects.
Q: How should Chlorpyrifos be applied for optimal results?
A: Application methods vary by formulation and target pest. For soil applications, incorporate Chlorpyrifos into the top 2-6 inches of soil. Foliar sprays should use 0.5-2 lbs active ingredient per acre, depending on crop and pest pressure. Granular formulations are ideal for broadcast applications. Always follow label directions regarding application rates, timing, and pre-harvest intervals. Proper application equipment calibration is crucial for effective pest control while minimizing environmental impact.
Application Guidelines
| Crop | Pest | Rate (ai/acre) | PHI (days) |
|---|---|---|---|
| Corn | Rootworm, Cutworm | 0.25-0.5 lb | 21 |
| Citrus | Scale, Mealybug | 1.0-2.0 lb | 14 |
| Soybeans | Stink Bug, Aphids | 0.5-1.0 lb | 28 |
Q: What safety precautions should be taken when handling Chlorpyrifos?
A: Always wear proper personal protective equipment (PPE) including chemical-resistant gloves, long sleeves, pants, shoes plus socks, and eye protection. A NIOSH-approved respirator is recommended when mixing concentrated formulations or working in enclosed spaces. Avoid skin contact and inhalation. Wash hands thoroughly after handling and before eating or smoking. Store Chlorpyrifos in its original container away from food and feed in a cool, dry, well-ventilated area. In case of exposure, follow first aid measures on the label and seek medical attention if symptoms occur.
Environmental Considerations
While Chlorpyrifos is highly effective, proper environmental stewardship is essential. Key considerations include:
- Do not apply near water bodies or where runoff may occur
- Maintain appropriate buffer zones
- Avoid applications during peak pollinator activity
- Follow all local regulations and restrictions
Comparative Advantages
Chlorpyrifos offers several benefits compared to alternative insecticides:
- Longer residual activity (typically 2-4 weeks)
- Broad-spectrum control reduces need for multiple products
- Effective against both surface and soil-dwelling pests
- Multiple formulation options for various application needs