Major chemical rodenticide categories
- Acute rodenticides (e.g. Zinc Phosphide): Fast-acting single-dose poison that releases toxic phosphine gas in the rodent's stomach; requires 2 to 3 days of plain food pre-baiting to overcome rodent bait shyness.
- Anticoagulant rodenticides (e.g. Bromadiolone, Brodifacoum): Multi-dose or single-feeding baits that disrupt blood clotting mechanisms; rodents perish gradually after 3 to 7 days without alerting the colony.
- Bait formulations: Available as ready-to-use wax blocks (suitable for damp field burrows), dry loose grains, and topical pastes.
Safe field application and burrow baiting technique
Identify active rat holes by closing all burrow openings with soil in the evening; treat only those burrows that are found reopened the next morning. Place poisoned baits at least 15 to 20 cm deep inside the active burrow and seal the opening lightly with turf. Never scatter rodenticide openly in barnyards where cows, goats, poultry, or domestic dogs can consume it.
First aid, antidotes and carcass management
- Antidote for anticoagulants: Vitamin K1 (Phytomenadione) is the specific medical antidote administered under doctor supervision.
- Phosphide poisons: Have no chemical antidote; accidental ingestion requires immediate emergency hospitalization for stomach decontamination.
- Collect dead rodents using gloves or tongs and bury them at least 0.5 meters underground to avoid poisoning birds of prey and farm animals.
Official source
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Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
What is the difference between Zinc Phosphide and Bromadiolone?
Zinc Phosphide is an acute single-dose poison that acts within hours, whereas Bromadiolone is an anticoagulant that works over several days, avoiding bait shyness.
What should be done if a farm animal accidentally eats rat poison?
Rush the animal to a veterinary doctor immediately; take the poison wrapper along so the vet can administer the correct antidote (such as Vitamin K1 for anticoagulants).
Why is pre-baiting necessary when using Zinc Phosphide in crop fields?
Offering unpoisoned grain for 2 to 3 days encourages rats to feed confidently before poison is introduced, preventing bait aversion.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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