Abstract
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.
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