Repellency of Plant Extracts against the Legume Flower Thrips Megalurothrips sjostedti (Thysanoptera: Thripidae)

Abtew Andnet Bayleyegn, Subramanian Sevgan, Cheseto Xavier, Kreiter Serge, Tropea Garzia Giovanna, Martin Thibaud. 2015. Repellency of Plant Extracts against the Legume Flower Thrips Megalurothrips sjostedti (Thysanoptera: Thripidae). Insects, 6 (3) : pp. 608-625.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Abstract : Megalurothrips sjostedti Trybom is an important pest of cowpea (Vigna unguiculata L.) in Africa. To propose an alternative to chemical control, the repellency of 24 plant extracts was evaluated against adult female thrips of M. sjostedti in the laboratory. Plant extracts in ethanol were separately applied on a filter paper disk in a still air visual cue olfactometer. The results showed highly significant differences in repellency among extract type, concentration and their interactions. We classified the level of repellency into four categories as strong, good, moderate and weak or non- repellent based on hierarchical ascendant classification. We identified Piper nigrum, Cinnamomum zeylanicum, Cinnamomum cassia as strong repellents. Five extracts were classified as good, eight as moderate and the remaining eight extracts were weak or non-repellent. Repellency of the extracts increased with the concentration suggesting that the behavioral response of M. sjostedti was dose-dependent. Mono- and sesquiterpene hydrocarbon compounds from seven highly repellent extracts were identified by gas chromatography-mass spectrometry (GC/MS). The use of repellent extracts could be useful in developing integrated pest management strategies for thrips on legume crops. In this regard, the specific modes of action of the identified compounds need to be investigated to incorporate them into the existing crop protection strategies. (Résumé d'auteur)

Mots-clés Agrovoc : Lutte biologique, Répulsif d'origine végétale, Protection des plantes, Vigna unguiculata, Ravageur des plantes, Extrait d'origine végétale, Extrait, Composition chimique, Hydrocarbure aromatique, Spectrométrie de masse, Piper nigrum, Cinnamomum aromaticum

Mots-clés géographiques Agrovoc : Afrique au sud du Sahara

Mots-clés complémentaires : Cinnamonum zeylanicum, Megalurothrips sjostedti

Mots-clés libres : Plant extracts, Repellency, Megalurothrips sjostedti, Olfactometer, Piper nigrum

Classification Agris : H10 - Pests of plants
F60 - Plant physiology and biochemistry

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Abtew Andnet Bayleyegn, ICIPE (KEN)
  • Subramanian Sevgan, ICIPE (KEN)
  • Cheseto Xavier, ICIPE (KEN)
  • Kreiter Serge, Montpellier SupAgro (FRA)
  • Tropea Garzia Giovanna, Universita di Catania (ITA)
  • Martin Thibaud, CIRAD-PERSYST-UPR HortSys (FRA)

Source : Cirad-Agritrop (

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