Nicotine Vapor in Codling Moth Control1

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Abstract
In 1928, atomized nicotine alkaloid in various petroleum carriers, and in 1934, tests with liquid HCN on tent covered trees, indicated that these materials were impractical for fumigation of apple trees. Preliminary tests show that "Black Leaf 50," when vaporized by heat, possesses a high degree of toxicity, 6-10 cc. apparently being sufficient to kill all the codling moths in a 25-foot tree. A "Nicofumer" was built to vaporize and blow the fumes into a portable "fumatorium" enclosing the tree. Labor, material and depreciation cost about $3.75 per acre per treatment.

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