Which is not considered a single dose rodenticide?

Warfarin is classified as a multiple-dose rodenticide rather than a single-dose option. This means that it requires repeated consumption over time to achieve its lethal effect on rodents. Warfarin works by interfering with the rodent's blood-clotting mechanism, leading to death from internal bleeding after several doses are ingested.

In contrast, substances like ANTU, strychnine, and red squill are all single-dose rodenticides, which means that a single exposure can lead to death. Strychnine acts quickly on the nervous system, causing severe muscle spasms and respiratory failure. ANTU, primarily a bait formulation, causes damage to the liver and other organs after ingestion. Red squill is toxic due to its impact on the heart and respiratory system.

Understanding the classification of rodenticides is crucial for effective pest management and public health as it influences how the chemicals are used and their potential risks to non-target species, including humans and pets.