African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6590

Full Length Research Paper

Assessing the effects of Lecanicillium lecanii in the biological control of early and late leaf spot of peanut in vitro (Burkina Faso, West Africa)

Tounwendsida Abel NANA
  • Tounwendsida Abel NANA
  • Equipe Phytopathologie et Mycologie Tropicale (PM-Prop), Unité de Formation et de Recherche en Sciences de la Vie et de la Terre (UFR/SVT), Université Joseph KI-ZERBO, 03 BP 7021 Ouagadougou 03, Burkina Faso.
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Adama ZONGO
  • Adama ZONGO
  • Institut des Sciences de l’Environnement et du Développement Rural (ISEDR), Université de Dédougou, BP 176 Dédougou, Burkina Faso.
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Bawomon Fidèle NEYA
  • Bawomon Fidèle NEYA
  • Université Nazi BONI/Centre Universitaire de Gaoua 01, P. O. Box 1091, Bobo-Dioulasso 01, Burkina, Faso.
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Philippe SANKARA
  • Philippe SANKARA
  • Université Aube Nouvelle 06 P. O. Box 9283 Ouagadougou 06, Burkina Faso.
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  •  Received: 28 October 2021
  •  Accepted: 15 December 2021
  •  Published: 31 January 2022

Abstract

Early and late leaf spots caused by Cercospora arachidicola and Phaeoisariopsis personata respectively, are the most widespread peanut fungal diseases in West Africa. These diseases lead to notable crop losses in the rural area. In the recent decades, chemical fungicides are used to fight against crop losses, but these chemical substances cause big damages to the environment including the animals and human beings. Thus, the biological control is encouraged by scientific community and all government because it is well known to be safety and cost effective. For this reason, we investigated on the effectiveness of Lecanicillium lecanii on leaf spots of peanut in Burkina Faso. To do so, spore suspensions (106 spores / ml) from four strains of L. lecanii was used in vitro. The results revealed that L. lecanii 4181 inhibited the pathogen conidia germination up to 87%, as well as elongation germ tube with highest rate of 56%. Compared to the distilled water control, the severity scores vary between 5.7 and 8, but our results showed a notable decrease of score from 2.3 and 4.7. From our findings, the treatments with L. lecanii spore suspensions on peanut leaves significantly reduced the severity of leaf spots and may be potentially used to promote organic farming in West Africa.

Key words: Foliar diseases, biological control, peanut, agriculture.