Is it true that piscicides are pesticides that control spiders?

Piscicides are specifically formulated to control fish populations and have no relation to spiders or other terrestrial pests. The term "piscicide" comes from the Latin word "piscis," meaning fish, thus highlighting their use in aquatic environments for managing fish species, often in contexts such as fisheries management or to control invasive species.

In the broader context, pesticides vary in function, with categories designed for insects, fungi, weeds, and other pests. Each of these categories includes substances specifically developed to target particular organisms, and in this case, piscicides focus solely on aquatic life forms rather than any type of arachnid. Therefore, asserting that piscicides control spiders is incorrect, as they serve a completely different purpose and are intended for a different ecosystem.