Initial Pesticide Certification Practice Test

On pesticide labels, the signal word communicates how toxic the product is in the short term. The most severe indicator used is the word that means serious harm or death from a brief exposure. When you see this word, you know the product is highly toxic or corrosive, and the label will come with strict precautions—often a skull-and-crossbones symbol and clear, protective instructions. This is why it signals the highest acute hazard.

A step down in severity is the word that signals lower acute toxicity, still requiring caution but not at the extreme level of the first word. A further step down uses a word that marks relatively low hazard, guiding users that ordinary care is still needed but the risk is much smaller. The phrase “Use with care” isn’t a formal, standardized signal word on pesticide labels, so it doesn’t convey a precise toxicity level like the other terms.

So the word that represents the highest acute hazard is the one that communicates severe danger and triggers the strongest safety precautions.