What is the defining characteristic of "acute" rodenticides?

The defining characteristic of "acute" rodenticides is that they provide a quick knockdown of a rodent population. Acute rodenticides are designed to cause death rapidly after a single exposure or dose. This swift action is particularly beneficial in situations where immediate control of a rodent infestation is necessary.

By causing an immediate effect, these rodenticides are effective in reducing rodent numbers quickly, which is essential in scenarios where rodents pose health risks or damage to property. This characteristic sets them apart from chronic rodenticides, which require multiple doses and lead to a slower decline in rodent health over time.

While other options might describe aspects of rodenticides in general, the hallmark of acute rodenticides is their rapid action, making them suitable for urgent control measures.