Effectiveness Following Kiln-Drying of Insecticides Applied to Green Lumber to Control Lyctus Powder-Post Beetle Attack

This investigation was made to determine whether large-pored hardwood lumber can be dipped at the sawmill in an aqueous solution of an insecticide and remain adequately protected against Lyctus powder-post beetles (Lyctus planicollis, LeConte) despite subsequent kiln-drying. A water-borne insecticide treatment would be less expensive than an oil-borne treatment. Sets of ash boards were given a 10-second dip in a series of insecticidal solutions, kiln-dried using a standard schedule in 7 days, stored under the conditions of 80?F. and 70 percent relative humidity, and then exposed to egg-laying by Lyctus planicollis LeConte. The criterion of infestation was the emergence holes of a new generation of beetles. At the end of 1 year, the sets of boards that received 0.5 percent aldrin, dieldrin, and heptachlor dip treatment were completely free of holes. The 2.0 percent and 0.2 percent chlordane, 0.05 percent dieldrin, 0.5 percent lindane, and control sets had 2, 16, 62, 334, and 903 holes, respectively. Four of the five chemicals of the appropriate concentrations apparently will persist in lumber in effective amounts through kiln-drying and can be applied to green lumber at the sawmill. Evidence was obtained of a short cycle of beetle development of approximately 3 months and a long cycle of 7 months.

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