Organic Termite Prevention: Nematodes, Barriers, and Moisture Control

A homeowner seeks non-chemical termite prevention for the exterior to protect their home.

Biological Control: Beneficial Nematodes

Steinernema species (entomopathogenic nematodes) attack subterranean termites. Effectiveness depends on:

• Strain adaptation to local termite species
• Cool, moist conditions (nematodes die in sun/heat)
• Proper application in termite interceptors

Resources: Jerry Cates' "How Nematodes Kill Termites" (Bugs In The News), Northwest Coalition for Alternatives to Pesticides.

Physical Barriers & Moisture Management

• Metal mesh screens and dry sand barriers at foundation
• Eliminate moisture sources: fix leaks, grade soil away from foundation
• Remove wood debris, stumps, and cellulose near structure

Structural Treatments (If Termites Enter)

Microwaves, boric acid, electrocution, and fungal pathogens for drywood/dampwood termites in walls. Subterranean termites require soil treatments.

University of California and Environmental Health Coalition provide detailed guides. Biological control is promising but not yet definitive for landscape protection.