Effect of Lindane Emulsion Sprays on the Insect Invasion of White Pine Sawlogs and the Grade Yield of the Resulting Lumber1

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Abstract
Based on examination of the sapwood surface of logs in the autumn (Oct. 9-15), a single early spring applica-tion (April 8) of a lindane emulsion spray (diluted in water to 0.4% gamma isomer by volume) on individual, unseasoned white pine sawlogs in Massachusetts gave 98.7 to 100% protection against all insect damage (includes Cerambycidae, Buprestidae, Curculionidae, and both the ambrosia and bark beetle types of Scolytidae). A 0.2% gamma spray gave 87.2 to 100% protection. A 0.1% gamma spray gave 85.1 to 99.3% protection against all except ambrosia beetles, against which it apparently failed. Ten logs were in each sprayed group. Downgrading one or more grades to Number 5 common because of insect damage in the 0.4, 0.2, and 0.1% gamma isomer treatments amounted to 6.1, 5.3, and 8.9%, respectively, compared with 81.4% in the un-sprayed checks. This downgrading was attributed chiefly to large worm holes made by Cerambycidae and possibly some Buprestidae. Additional downgrading due to the tiny pinworm holes made by ambrosia beetles was not significant in this test.

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