Effect of a pentacyclic triterpene from sweet potato storage roots on oviposition by the sweetpotato weevil (Coleoptera: Curculionidae)
Wilson, D.D. | Son, K.C. | Severson, R.F. | Kays, S.J.
A pentacyclic triterpenoid, boehmeryl acetate, was identified as the dominant peak in gas chromatographic profiles of the periderm of susceptible sweet potato cultivars. Boehmeryl acetate, present in the methylene chloride-hexane (1:3) fraction of methylene chloride surface extracts, induced significantly (P < 0.05) higher oviposition by female sweetpotato weevils on sweet potato cores in laboratory bioassays. Dose-response studies showed significant linear and quadratic log dose effects, with peak oviposition stimulating activity for this compound at about 0.01 potato equivalents (0.04 microgram/core). Results indicate that boehmeryl acetate is an oviposition stimulant of the sweetpotato weevil, Cylas formicarius elegantulus (Summers).
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