Biology of the African sweetpotato weevil species

N.E.J.M. Smit, A. van Huis

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4 Citations (Scopus)


The biology of two African sweetpotato weevil species, Cylas pitncticollis and C. bninnens (Fabricius) (Coleoptera: Apionidae), was studied in laboratory experiments carried out at 27 ±1°C, 45 ±5% RH, and a 12 h photophase. Cylns pinicticollis females lived longer than C. brunneus (141 ±10 and 92 ±12 days respectively), developed faster (egg to adult 20-28 days, and 32-41 days respectively) and had a lower oviposition rate (1.10±0.04 and 1.53 ±0.06 eggs per female per day respectively). The total egg production per female (average 101), sex ratio (1:1) and proportion of eggs surviving to adulthood (average 89%) were similar for both species. The intrinsic rate of increase was higher for C. pnncticoUis (0.553 per 10-day period compared to 0.521 for C. brunneus). Under field conditions C. bhmneiis will benefit from its higher oviposition rate during periods of favourable conditions for sweet potato weevils, like dry spells which expose tubers for egg laying. Cylns pitncticollis will benefit from its longer longevity during less favourable conditions, as females can survive extended periods when no oviposition sites are available and then resume egg laying when conditions improve. Key Words: sweetpotato weevil, Cylas pnncticollis, Cylas brunneus, Ipomoca batatas, biology, Kenya
Original languageEnglish
Pages (from-to)93-100
JournalInsect Science and its Application
Issue number2
Publication statusPublished - 1999


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