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Variegated Cutworm: Consumption of Sugarbeet Foliage and Development on Sugarbeet

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Mean weight of larvae of Peridroma saucia (Hübner) increased from 0.47±0.17 mg at instar 2 to a maximum of 869.14±216.04 mg at instar 6 when fed sugarbeet foliage; mean pupal weight was 0.278±0.048 g. Mean larval length increased from 0.242±0.036 cm to a maximum of 3.46±0.320 cm during these instars. Mean total development time for instars 2–6 was 27.49 days. Larval consumption increased in proportion to larval weight and length. Total foliage consumption during instars 4–6 was 3.09±1.66, 18.72±7.34, and 109.04±17.44 cm22. Foliage consumption and days to completion of larval development can be estimated from larval weight. The formula,

No. insects/plant = % defoliation × total leaf area/plant / consumption × no. days feeding × 100

can be used to estimate the number of variegated cutworms necessary to inflict economic damage.

Document Type: Research Article

Publication date: December 1, 1978

More about this publication?
  • 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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