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Modeling the impact of sweetpotato weevils on storage root yield

Daniel A. Akansake / Putri E. Abidin / E. E. Carey
  • Country Liaison Scientist, Sub-Saharan Africa Research, International Potato Center, Kumasi, Ghana
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2018-10-18 | DOI: https://doi.org/10.1515/opag-2018-0035


This study estimated the amount of loss in storage roots caused by various levels of damage caused by sweetpotato weevils (Cylas spp). Seven varieties of sweetpotato (Ipomoea batatas L. (Lam)) were evaluated in three production sites in northern Ghana for two years (2014 and 2015). Yield data for each experimental plot were collected. A regression analysis was carried out using the generalized linear model approach. In the study, nonmarketable roots were classified as all undersized roots (<100g) and spoilt roots due to weevil, millipede, and soft rot. The results indicated weevil damage as the only significant predictor of nonmarketable yield at 5% level of significance. From the study, the average values for total root yield, marketable root yield, and nonmarketable root yield were 9.39, 6.71, and 2.67 ton/ha respectively. The minimum weevil damage (score 2) resulted in a yield loss of 2 ton/ha which represents 8.3% while severe damage at score 9 could cause a loss of 7.43 ton/ha of storage roots representing 31% of the attainable yield of sweetpotato. Weevil susceptibility needs to be treated as a serious trait when evaluating sweetpotato genotypes to be released as varieties.

Keywords: sweetpotato; weevil; nonmarketable; roots; damage


  • Agble R., The Nutrition Profile for the Republic of Ghana, Nutrition and Consumer Protection Division, FAO, 2009Google Scholar

  • Beyene K., Destitution, Biology, Yield Loss and Management of Sweet Potato Weevils (cylas formicaries (fabrcius) Insecta: Coleoptera) in Ethiopia, J. Biol. Agric. Healthcare, 2015, 5, 65-72Google Scholar

  • CSIR-CRI, Sweet potato: The crop of the future, Crop Research Institute of Council for Scientific and Industrial Res. Ghana Factsheet, November, 2002, 6Google Scholar

  • CSIR-CRI, Sweet potato genotypes proposed for release, Crop Research Institute of Council for Scientific and Industrial Res. Ghana, 2005, 1-35Google Scholar

  • Ebregt E., Struik P.C., Abidin P.E., Odongo B., Farmers’ information on sweet potato production and millipede infestation in northeastern Uganda. I. Associations between spatial and temporal crop diversity and the level of pest infestation, NJAS-Wagen. J. Life Sc., 2004, 52, 47-68Google Scholar

  • Ebregt E., Struik P.C., Odongo B., Abidin P.E., Pest damage in sweet potato, groundnut and maize in north-eastern Uganda with special reference to damage by millipedes (Diplopoda), NJAS-Wagen. J. Life Sc., 2005, 53, 49-69Google Scholar

  • Ebregt E., Are millipedes a pest in low-input crop production in north-eastern Uganda? Farmers’ perception and experimentation, PhD thesis, Wageningen University, Wageningen The Netherlands, 2007Google Scholar

  • Ghana Statistical Service Report 2010, Population Census, District Analytical Report, 2014Google Scholar

  • Hotz C., Loechl C., Brauw A.D., Eozenou P., Gilligan D., Moursi M., et al., A large-scale intervention to introduce orange sweet potato in rural Mozambique increases vitamin A intakes among children and women, Br. J. Nutr., 2012, 108, 163-176Google Scholar

  • Lagnaoui F.C., Alcázar J., Morales F., A sustainable pest management strategy for the sweetpotato weevil in Cuba: a success story, Food Fertilizer Tech. Center Exten. Bull., 2000, 493, 1-7Google Scholar

  • Low J., Lynam J., Lemaga B., Crissman, C., Barker, I., Thiele G., et al., Sweetpotato in Sub-Saharan Africa, In: Loebenstein G., Thottappilly G. (Eds.), The Sweetpotato, Springer Science+Business Media B.V., 2009Google Scholar

  • Quaye W., Food security situation in northern Ghana, coping strategies and related constraints, Afr. J. Agric. Res., 2008, 3, 334-342Google Scholar

  • Smit N.E.J.M., Integrated pest management for sweetpotato in Eastern Africa, PhD thesis, Wageningen University, Wageningen, 1997Google Scholar

  • Stathers T., Carey E., Mwanga R., Njoku J., Malinga J., Njoku A., et al., Everything You Ever Wanted to Know about Sweetpotato: Reaching Agents of Change ToT Manual, Vol. 4., International Potato Center, Nairobi, 2013Google Scholar

  • Sushanta K.J., Nedunchezhian M., Misra R.S., The Triple ‘f’ (food, fodder and fuel) Crop Sweet Potato [Ipomoea batatas (L.) Lam.], Orissa Rev., 2011, http://magazines.odisha.gov.in/Orissareview/2011/Dec/engpdf/83-93.pdf WHO, Global prevalence of vitamin A deficiency in populations at risk 1995 - 2005: WHO global database on vitamin A deficiency, WHO Press, Geneva, 2009 Agble R., The Nutrition Profile for the Republic of Ghana, Nutrition and Consumer Protection Division, FAO, 2009Google Scholar

About the article

Received: 2018-03-29

Accepted: 2018-06-07

Published Online: 2018-10-18

Published in Print: 2018-10-01

Citation Information: Open Agriculture, Volume 3, Issue 1, Pages 319–319, ISSN (Online) 2391-9531, DOI: https://doi.org/10.1515/opag-2018-0035.

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© by Daniel A. Akansake et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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