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Effect of Defoliation at Specific Growth Stages on Potato Yields

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Defoliation of 'Superior' and 'Russet Burbank' cultivar potatoes by the Colorado potato beetle, Leptinotarsa decemlineata (Say), and the variegated cutworm, Peridroma saucia (Hübner), was simulated by hand defoliation in a 2-year field study. 'Superior' and 'Russet Burbank' cultivars were defoliated at four and five different plant growth stages, respectively, during the growing season, with defoliation levels ranging from 10 to 75%. Defoliation during the full bloom period resulted in greater yield reductions than defoliation before or after full bloom. Defoliation of > 10% of the upper leaves on 'Superior' and 'Russet Burbank' cultivars during full bloom resulted in significant yield loss. Also, 10% lower leaf loss during full bloom on 'Russet Burbank' plants resulted in yield loss. Single-event defoliation thresholds for 'Superior' and 'Russet Burbank' cultivars are proposed.

Document Type: Research Article

Publication date: October 1, 1984

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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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