Branch "Tip" Sampling for Determining Abundance of Spruce Bud worm Egg Masses1

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Counting of the spruce bud worm (Choristoneura fumiferana (Clem.)) on balsam fir branches has always been a tedious task. A technique is presented which modifies previously developed methods by reducing the size of the sample without greatly decreasing its accuracy. The technique consists essentially of separating the tips of the shoots from the rest of the branch. The number of egg masses on the tips must be increased by only 16% to obtain the total number on the branch. Time saved by this technique ranges from 25 to 40%, depending upon the size of the branch, over previous techniques. Branches of any size and from any of the crown are within the scope of this technique. The method is not feasible on branches with severe or complete defoliation.

Document Type: Research Article

Publication date: August 1, 1959

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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