Insecticide

Definition

A pesticide compound or agent formulated to kill, repel, or disrupt the development of insects. Insecticides are classified by their mode of action (contact, systemic, stomach, fumigant), chemical class (organophosphates, pyrethroids, neonicotinoids, insect growth regulators), or target life stage (ovicides against eggs, larvicides against larvae, adulticides against adults). They serve critical roles in agricultural protection, public health vector control, and management of structural, veterinary, and medical pests.

Etymology

From Latin insectum (insect) + -cide (killer), modeled on pesticide.

Example

Rotating between pyrethroid and organophosphate insecticides in malaria control programs delays the evolution of resistance in Anopheles mosquito populations.

Synonyms

• insect toxicant

Related Terms

• Pesticide
• acaricide
• ovicidal
• Larvicide
• insecticide resistance
• Integrated Pest Management
• vector control
• neonicotinoid
• pyrethroid
• Insect growth regulator

Usage Notes

In strict usage, insecticide denotes agents targeting insects specifically; acaricides target mites and ticks, though many compounds have dual activity. The term excludes biological control agents such as predators or parasitoids unless these are formulated as microbial insecticides (e.g., Bacillus thuringiensis). Resistance management protocols often restrict the term to synthetic or formulated products rather than cultural or physical control methods. In medical entomology, insecticide-treated bed nets and indoor residual spraying represent the primary chemical interventions against disease vectors.