Which category of pesticides is considered practically non-toxic?

The category of pesticides considered practically non-toxic is Category IV. This classification indicates that pesticides within this group pose very little risk to human health and the environment when used according to label instructions. Category IV pesticides generally do not require special precautions when applying and are often used in residential settings. They are characterized by low toxicity through various routes of exposure, such as ingestion, inhalation, or dermal contact, leading to minimal adverse effects.

In contrast, the other categories represent increasing levels of toxicity, with Category I being the most toxic and requiring the greatest caution. Understanding these categories is crucial for safe pesticide application and compliance with regulatory standards, ensuring that applicators can make informed decisions based on the toxicity level of the products they use.