Synthetic pyrethroids Sherpa, Ripcord in 0.1%, 0.2% and 0.5%, Cyperkill, Sunmerin and Bulldock in 0.5% concentrations proved the most effective upto 16 months against powder post beetles attacking the fuel wood. In single spray Sherpa afforded 88, 92, 95% billets in the same concentrations for the same period. Cyperkill, Sunmerin and Bulldock in 0.5% concentration gave 82, 95 and 91% protection of billets, respectively as compared to control in which 41% billets remained safe from beetles infestation. Sherpa and Ripcord in 0.1%, 0.2%, 0.5% gave net benefit over control of Rs. 9561, 9102, 7732 and 8292, 8442, 7757 per 1000 cft, respectively. Sunmerin (0.2%) and Bulldoxk (0.5%) gave net benefit of Rs. 8812 and 8965, respectively for the same volume of wood. Sundophos and Laser are the least effective and persistent, giving maximum net benefit of Rs. 4295 and 4224, respectively.