Methods for Control of Insects Attacking Green Logs and Lumber

Investigations conducted during the period 1944 to 1951 have shown that benzene hexachloride when properly applied, is effective in preventing attack by ambrosia beetles, bark beetles, and wood borers on green hardwood logs and lumber and on pine logs. A concentration of sufficient benzene hexachloride to give 1-3/4 lbs. of the gamma isomer per 50 gallons of No. 2 fuel oil is recommended for the prevention of attack by ambrosia beetles on hardwood and pine logs. This formulation has given good protection for 3 to 4 months during the season of heaviest beetle activity. Wettable benzene hexachloride at a concentration of 2 lbs. of the gamma isomer in 50 gallons of water has protected hardwood logs for a period of 3 to 4 months in limited tests. Sufficient benzene hexachloride to give 7/8 lb. of the gamma isomer per 50 gallons of No. 2 fuel oil is recommended for preventing attack by bark beetles on pine. Wettable benzene hexachloride at 1 lb. of the gamma isomer in 50 gallons of water also has shown promising results on pine. Each of these formulations must be applied until all bark surface is wet, or at the rate of 1 gallon per 100 sq. ft. of bark surface. They can be applied after the logs are stacked provided proper equipment is used. In fact, to obtain best results from chemical treatment, logs should be stacked as high as it is possible to spray them and in long continuous rows rather than in a number of small decks. An emulsion of benzene hexachloride containing 5 ounces of the gamma isomer per 50 gallons of water is recommended for preventing attack by ambrosia beetles on green hardwood lumber. It is applied by dipping in vats in conjunction with measures for preventing sap stain. Mists and dusts of benzene hexachloride applied to stacks of lumber are also effective in preventing attack by ambrosia beetles. Considerable care must be exercised in applying them; otherwise over-dosage will result in excessive costs.

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