Nematicide

Definition

A pesticide formulated to kill or suppress nematodes, particularly plant-parasitic species that damage crop roots. Nematicides are typically broad-spectrum neurotoxicants with high volatility or soil mobility, applied as soil fumigants, drenches, or seed treatments. Most modern nematicides are carbamates or organophosphates that inhibit acetylcholinesterase, though their use is increasingly restricted due to mammalian toxicity, groundwater contamination, and non-target effects on soil arthropods and pollinators.

Etymology

From nemat- (Greek nēma, thread, referring to nematodes) + -cide (killer), following standard pesticide nomenclature.

Example

Aldicarb, a systemic carbamate nematicide formerly used in potato production, kills plant-parasitic nematodes and soil-dwelling insect pests through cholinesterase inhibition, but its deregistration in many countries reflects broader phase-outs of highly toxic soil-applied pesticides.

Synonyms

• nematocide

Related Terms

• acaricide
• Insecticide
• Fumigant
• Integrated Pest Management
• soil ecology
• Nematode
• cholinesterase inhibitor
• broad-spectrum pesticide

Usage Notes

Contrast with acaricide (targeting mites and ticks) and insecticide (targeting insects); some nematicides have incidental activity against soil arthropods. Many jurisdictions now favor non-chemical alternatives—biological control using entomopathogenic nematodes, cover crops, or soil amendments—over synthetic nematicides. The term is sometimes spelled 'nematocide,' though 'nematicide' predominates in agricultural literature.