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The influence of volatile semiochemicals from stink bug eggs and oviposition-damaged plants on the foraging behaviour of the egg parasitoid Telenomus podisi

Published online by Cambridge University Press:  14 June 2016

M.F.F. Michereff
Affiliation:
Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Brasília, Brazil
M. Borges
Affiliation:
Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Brasília, Brazil
M.F.S. Aquino
Affiliation:
Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Brasília, Brazil Universidade de Brasília, Brasília, Brazil
R.A. Laumann
Affiliation:
Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Brasília, Brazil
A.C.M. Mendes Gomes
Affiliation:
Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Brasília, Brazil
M.C. Blassioli-Moraes*
Affiliation:
Embrapa Recursos Genéticos e Biotecnologia (Cenargen), Brasília, Brazil
*
*Author for correspondence Phone: +55 (61) 3448-4932 Fax: +55 (61) 3340-3462 E-mail: carolina.blassioli@embrapa.br

Abstract

During host selection, physical and chemical stimuli provide important cues that modify search behaviours of natural enemies. We evaluated the influence of volatiles released by eggs and egg extracts of the stink bug Euschistus heros and by soybean plants treated with the eggs and egg extracts on Telenomus podisi foraging behaviour. Responses to volatiles were evaluated in Y-tube olfactometers after exposure to (1) one egg cluster for 24 h; (2) plants with eggs laid by the stink bug, tested at 24, 48, and 72 h after treatment; (3) plants with eggs laid artificially, tested at 24, 48, and 72 h after treatment; and (4) plants treated with acetone or hexane extracts of eggs. Telenomus podisi was attracted to volatiles emitted by one egg cluster and to acetone extracts of one egg cluster, but not to air or acetone controls. There were no responses to odours of plants treated with eggs or egg extracts. Analysis of acetone extracts of egg clusters by gas chromatography revealed the major components were saturated and unsaturated fatty acids, including hexadecanoic acid, linoleic acid, and (Z)-9-octadecenoic acid. Our results suggest that one egg cluster and the acetone extract of one egg cluster contain volatile compounds that can modify T. podisi foraging behaviour, and that the amounts of these compounds, probably together with some minor compounds, are important for host recognition by T. podisi. Also, the oviposition damage or egg extracts on the plant did not elicit indirect defences that attracted Telenomus podisi.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2016 

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