Agritrop
Accueil

Ripe coffee berry volatiles repel second instar nymphs of Antestia bugs (Heteroptera: Pentatomidae: Antestiopsis thunbergii)

Njihia Teresiah, Torto Baldwin, Murungi Lucy Kananu, Irungu Janet, Mwenda Dickson, Babin Régis. 2018. Ripe coffee berry volatiles repel second instar nymphs of Antestia bugs (Heteroptera: Pentatomidae: Antestiopsis thunbergii). Chemoecology, 28 (3) : 91-100.

Article de revue ; Article de recherche ; Article de revue à facteur d'impact
[img] Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
Nji6.pdf

Télécharger (4MB) | Demander une copie

Quartile : Q2, Sujet : ECOLOGY / Quartile : Q3, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Understanding the roles of volatile organic compounds (VOCs) in insect–plant interactions is a key component towards the development of safe pest management strategies and sustainable agriculture. Kairomones in unripe berries of Coffea arabica mediate host recognition of second instar nymphs of Antestia bugs, Antestiopsis thunbergii Gmelin, and are good candidates for the pest management. In the current study, we investigated the VOCs that contribute to deterring the pest from ripe berries. Behavioral assays showed that headspace volatiles collected from ripe berries were significantly avoided by second instar nymphs. A mixture of the ripe berry volatiles and unripe berries (known preferred diet) was also significantly avoided when tested against blank or unripe berries, thereby confirming that VOCs from ripe berries had altered the host recognition process and had an odor masking effect. Coupled gas chromatography/mass spectrometric (GC/MS) analysis of the headspace volatiles revealed a blend of chemicals of which ten elicited electrophysiological activity in antennae of second instar nymphs. Five of these compounds including; 3-hydroxy-2-butanone, 2-heptanone, 2-isopropyl-3-methoxypyrazine [IPMP], 2-isobutyl-3-methoxypyrazine [IBMP] and (E)-β-caryophyllene were identified as unique to the volatiles of ripe berries and they elicited avoidance behavior in second instar nymphs when tested singly and in a blend. In addition, their blend also inhibited responses of nymphs to a synthetic attractant blend (kairomone). Our results suggest that the blend of the five compounds can be exploited as repellents in the management of A. thunbergii by pushing the pest away from coffee plantations or interfering with the pest–host recognition process through masking of suitable host odors.

Mots-clés Agrovoc : Coffea arabica, ravageur des plantes, kairomones, composé organique volatil, répulsif, odeur, relation hôte parasite

Mots-clés géographiques Agrovoc : Kenya

Mots-clés complémentaires : Antestiopsis thunbergii

Mots-clés libres : Antestiopsis thunbergii, Coffea arabica, Volatiles, Repellent, Coffee berry

Classification Agris : H10 - Ravageurs des plantes

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

Auteurs et affiliations

  • Njihia Teresiah, ICIPE (KEN) - auteur correspondant
  • Torto Baldwin, ICIPE (KEN)
  • Murungi Lucy Kananu, Jomo Kenyatta University of Agriculture and Technology (KEN)
  • Irungu Janet, ICIPE (KEN)
  • Mwenda Dickson, ICIPE (KEN)
  • Babin Régis, CIRAD-BIOS-UPR Bioagresseurs (KEN) ORCID: 0000-0002-3753-1193

Source : Cirad-Agritrop (https://agritrop.cirad.fr/588611/)

Voir la notice (accès réservé à Agritrop) Voir la notice (accès réservé à Agritrop)

[ Page générée et mise en cache le 2024-01-29 ]