African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Hot water immersion disinfests enset (Ensete ventricosum) suckers from the enset root mealybug Cataenococcus ensete Williams and Matile-Ferrero

Sisay Lemawork
  • Sisay Lemawork
  • Plant Protection Laboratory, Bureau of Agriculture, Hawassa, Ethiopia.
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Ferdu Azerefegne
  • Ferdu Azerefegne
  • Hawassa University, College of Agriculture, P. O. Box 05, Hawassa, Ethiopia.
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Tameru Alemu
  • Tameru Alemu
  • Hawassa University, College of Agriculture, P. O. Box 05, Hawassa, Ethiopia.
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Temesgen Addis
  • Temesgen Addis
  • Southern Agricultural Research Institute (SARI), Hawassa Research Center, P. O. Box 06, Awassa, Ethiopia.
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Guy Blomme
  • Guy Blomme
  • Bioversity International, Addis Ababa office, P. O. Box 5689, Addis Ababa, Ethiopia.
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  •  Received: 02 June 2018
  •  Accepted: 21 August 2018
  •  Published: 20 September 2018

Abstract

The enset root mealybug, Cataenococcus ensete Williams and Matile-Ferrero (Homoptera: Pseudococcidae) is a pest of national significance attacking enset in south and south-western Ethiopia. Adults and nymphs of several overlapping generations feed on the crops’ underground corms and roots, making them hard to reach and thus control. The main means of pest spread is through infested planting material. The objective of this study was to evaluate the effect of a hot water treatment of enset suckers against enset root mealybugs. Small, medium and large-sized infested enset suckers were each exposed to water temperatures of 21, 55, 75 and 95°C for periods of 10, 30, 60 and 300 s. Complete mealybug mortality was obtained for 60 s at 55°C and at 10 and 30 s exposure times at 75 and 95°C without affecting the performance of enset suckers of all size groups. Considering the ease of using boiling water for small-scale enset farmers, immersing suckers for at least 10 and up to 30 s at 95°C is advocated in order to eliminate all enset root mealybugs from enset suckers. The immersion of enset suckers in boiling water for 10 to 30 s can be easily demonstrated, with a much higher envisaged adoption rate by farmers.

Key words: Enset corm, enset roots, Ethiopia, integrated pest management (IPM), mortality, pseudostem, survival.