Deltamethrin possesses many advantages for the insecticidal protection of wood: relatively low toxicity, very reduced evaporation, very prolonged retention in the wood, very slight leaching after having penetrated the wood, and absence of odour. Its association with other active agents or solvents is being studied with regard to chemical compatibility. Compatibility studies have proved positive for azaconazole, TCMTB and MBT. The associaticn of 5 g/l deltamethrin + 50 g/l TCMTB + 50 g/l of MBT is used at a minimum rate of 5% for the preservation of freshly felled rough timber in tropical regions. With regard to insecticidal efficacy, the dilution of 0.025% deltamethrin is that considered effective for spraying in most applications. When the wood is not exposed to harsh weather conditions (sun), a dose of 0.0125% can be used, especially by steeping; at this preventive concentration, deltamethrin possesses a broad spectrum of action. The dose can be reduced even further against Hylotrupes bajulus.

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