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Damage to cassava, Manihot esculenta Crantz, by larvae of the southern armyworm, Spodoptera eridania (Cramer) and the black cutworm, Agrotis ipsilon (Hufnagel), was studied in greenhouse and field tests. Germination of seedpieces planted in a slanted position was reduced 13.5 and 40.0% by S. eridania and A. ipsilon, respectively. In vertically planted seedpieces, germination was reduced 68 and 36% by S. eridania and A. ipsilon, respectively. Damage by both species was greater when larvae attacked plants 5 or 10 days old than when larvae attached 15-day-old plants, causing only minor damage. The number of larvae per plant which can be tolerated without significant detriment to the plant under greenhouse conditions was one for each species.
Document Type: Research Article
Publication date: June 1, 1981
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.