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Relationship of Soybean Pod Development to Bollworm and Tobacco Budworm Damage

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Abstract:

Feeding damage by the bollworm, Heliothis zea (Boddie), and tobacco budworm, H. virescens (F.), to pods of the 'Davis' and 'Pickett-71' soybean cultivars did not differ significantly between insect speies. The cultivars ranged in developmental stage from early pod elongation to late pod fill. Damage was a negative function of the degree of pod development, when expressed as the number of seeds destroyed per larva, and when soybean development was expressed as the average thickness of pods in mm. Bollworm larvae each destroyed ca. 50 seeds on plants with pods in early developmental stages, but only ca. 5 seeds each on plants with pods in late developmental stages. The 6th instar was responsible for more damage than the 4th and 5th instars combined. These data provide necessary information to formulate better action levels (economic thresholds) for bollworm and tobacco budworm infestations during the R-4 through R-6 stages of soybean development.

Document Type: Research Article

Publication date: June 1, 1983

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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