Smothering / Suffocation

Oils and soaps that block insect spiracles (breathing pores), causing suffocation. Horticultural oils, vegetable oil sprays, and insecticidal soaps all work partly through this mechanism.

Key Products

Horticultural Oil Insecticidal Soap Vegetable Oil Spray

Advantages

Physical mode — no resistance possible. Safe for most beneficials after drying. Multiple product options.

Limitations

Must contact the insect while wet. Temperature restrictions. Phytotoxicity risk in heat.