Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Open Agriculture

1 Issue per year

Covered by: Elsevier - SCOPUS
Clarivate Analytics - Emerging Sources Citation Index

Open Access
See all formats and pricing
More options …

Preliminary observations on use of Beauveria bassiana for the control of the sweet potato weevil (Cylas sp.) in South Africa

Igenicious Hlerema
  • Corresponding author
  • Agricultural Research Council-Vegetable and Ornamental Plants, Private Bag X293, Roodeplaat, Pretoria, 0001, South Africa
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Sunette Laurie
  • Agricultural Research Council-Vegetable and Ornamental Plants (ARC-VOP), Private Bag X293, Roodeplaat, Pretoria, 0001, South Africa
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Bahlebi Eiasu
Published Online: 2017-12-29 | DOI: https://doi.org/10.1515/opag-2017-0063


Sweet potato weevils (Cylas puncticollis and C. formicarius) are notorious pests of sweet potato and cause severe losses in marketable yield. The study tested the use of Beauveria bassiana ((Balsamo) Vuillemin) (Deuteromycota: Hyphomycetes) for controlling sweet potato weevils. An experiment was conducted using four treatments: 1) dipping sweet potato cuttings in solution of 1 g/litre B. bassiana before planting, 2) spraying with the registered chemical Deltametrin at 50ml/100litre every 2 weeks for four months after planting, 3) spraying the leaves every 2 weeks with B. bassiana (10 g/100 litre) for four months after planting; and 4) a control (sprayed with distilled water). The experimental design was a Latin square with split plot design: pest management strategy as main plot factor and cultivars (Bophelo, Ndou and Blesbok) as subplot factors. Spraying with B. bassiana significantly reduced the percentage of insect damaged roots (5.31%) compared to the control (13.75%). Dipping did not significantly reduce the number of insect damaged roots (12.13%). There was no significant difference between the chemical spray (5.88% insect damage) and spraying with B. bassiana (5.31% insect damage). The preliminary investigation indicated that B. bassiana can be considered as an alternative control method for the sweet potato weevil.

Keywords: Beauveria bassiana; Cylas formicarius; Cylas puncticollis; sweet potato; root yield


  • Fuglie K., Priorities for potato research in developing countries: results of a survey. Amer. J. Potato Res., 2007, 84, 353-65Web of ScienceCrossrefGoogle Scholar

  • Visser D., A complete guide to vegetable pests in South Africa. Agricultural Research Council Roodeplaat Vegetable and Ornamental Plant Institute, Pretoria, 2011, pp. 316Google Scholar

  • Sorensen K.A., Sweet potato insects: identification, biology and management. In: Loebenstein, G. and Thottappilly, G. (Eds.). The sweet potato, Springer-Verlag New York Inc., USA, 2009Google Scholar

  • Stathers T.E., Rees D., Nyango A., Kiozya H., Mbilinyi L., Jeremiah S., Kabi S., Smit N., Sweet potato infestation by Cylas spp. in East Africa: II. Investigating the role of root characteristics. Int. J. Pest Manag., 2003, 49, 141-146Google Scholar

  • Smit N.E.J.M., Downham M.C.A., Laboke P.O., Hall D.R., Odongo B., Mass trapping male Cylas spp. with sex pheromones: A potential IPM component in Sweet potato production in Uganda. Crop Prot., 2001, 20, 643-651CrossrefGoogle Scholar

  • Hwang J.S., Hung C.C., Evaluation of the effect of integrated control of sweet potato weevil, Cylas formicarius Fabricius with sex pheromone and insecticide. Chinese J. Agric. Sci., 1991, 85, 477-493Google Scholar

  • Braun A.R., van de Flieart E., Implementation of IPM for sweet potato in Vietnam and Indonesia. Annual Progress Report. International Potato Centre, Lima, Peru, 1997Google Scholar

  • Laurie S.M., Booyse,M., Labuschagne M.T., Greyling, M.M., Multienvironment performance of new orange-fleshed sweet potato varieties in South Africa. Crop Sci., 2015, 55(4), 1585-1595Google Scholar

  • Mazet I., Hung S.Y., Boucias D.G., Detection of toxic metabolites in the hemolymph of Beauveria bassiana infected Spodoptera exigua larvae, Experientia, 1994, 50(2), 142-147CrossrefGoogle Scholar

  • Ondiaka S., Maniania N.K., Nyamasyo G.H.N, Nderitu J.H., Virulence of the entomopathogenic fungi Beauveria bassiana and Metarhizium anisopliae to sweet potato weevil Cylas puncticollis and effects on fecundity and egg viability, Annals of Applied Biology, 2008, 153(1), 41-48Web of ScienceGoogle Scholar

  • Pendland J.C., Boucias D.G., Ultrastructural localization of carbohydrate in cell walls of the entomogenous hyphomycete Nomuraea rileyi, Canadian Journal of Microbiology, 1992, 38(5), 377-386CrossrefGoogle Scholar

  • Pendland J.C., Hung S.Y., Boucias D.G., Evasion of host defense by in vivo-produced protoplast-like cells of the insect mycopathogen Beauveria bassiana, J Bacteriol, 1993, 175(18), 5962-5969Google Scholar

  • Pinnamaneni R., Potineni K., Mechanisms involved in the entomopathogenesis of Beauveria bassiana, Asian J. Environ Sci, 2010, 5(1), 65-74Google Scholar

  • Reddy G.V.P., Zhao Z.H., Humber R.A., Laboratory and field efficacy of entomopathogenic fungi for the management of the sweetpotato weevil, Cylas formicarius (Coleoptera:Brentida e), J. Invert Pathol, 2014, 122, 10-15Google Scholar

  • Yasuda K., Auto-infection system for the sweet potato weevil, Cylas formicarius (Fabricius) (Coleoptera: Curculionidae) with entomopathogenic fungi, Beauveria bassiana using a modified sex pheromone trap in the field, Appl. Entomol. Zool., 1999, 34(4), 501-5-5CrossrefGoogle Scholar

About the article

Received: 2017-02-02

Accepted: 2017-10-07

Published Online: 2017-12-29

Published in Print: 2017-12-20

Citation Information: Open Agriculture, Volume 2, Issue 1, Pages 595–599, ISSN (Online) 2391-9531, DOI: https://doi.org/10.1515/opag-2017-0063.

Export Citation

© 2018. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

Comments (0)

Please log in or register to comment.
Log in