Which of the following is not true about Class I insecticides?

The assertion that Class I insecticides require a pesticide certification to apply is indeed not true. Class I insecticides, which are classified due to their high toxicity levels, generally fall under regulations that typically necessitate certifications for individuals applying them. However, the requirement for certification isn't inherent to all Class I insecticides and can depend on jurisdictional regulations.

Class I insecticides are categorized as highly toxic, meaning they pose significant risks to both human health and the environment. Because of their high toxicity, they are often very effective for indoor use and can quickly eliminate pests. However, their potent activity does pose risks not just to targeted pests, but also to beneficial insects within the ecosystem. Thus, despite the assertion that a certification is required, the other characteristics of Class I insecticides regarding their toxicity, effectiveness for indoor scenarios, and potential negative impact on helpful insect populations are accurate representations of their nature.