Which statement best describes insecticides?

Study for the Ontario Pesticide Training and Certification CORE Test. Prepare with multiple-choice questions, get hints and explanations. Ensure readiness for your certification!

Insecticides are pesticides used to control insects. The best way to describe them is by how they enter an insect’s body and whether the active ingredient moves inside the plant or animal after application. Some insecticides must contact or be ingested by the insect, while others are systemic: once applied to a plant or animal, the chemical moves through the plant tissues or the animal’s circulatory system, so feeding insects or exposed pests encounter the toxin within the organism. This combination of entry route and systemic movement helps determine how the product is used—where it’s applied (soil, foliage) and whether it will move to reach pests that aren’t directly contacted.

The other options describe different pest groups and their own classification schemes (herbicides for weeds, fungicides for fungi, rodenticides for rodents), which don’t define how insecticides are categorized.