Identification of olfactory cues used in host-plant finding by diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae)

Identification of olfactory cues used in host-plant finding by diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae)

Olfactory attraction of female diamondback moths (Plutella xylostella) to odors of intact and homogenized host plants, as well as individual compounds characteristic of host plants, were investigated by behavioral and electrophysiological methods. Moths were attracted to odors of Brassica juncea and...

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Bibliographic Details
Published in:Journal of chemical ecology Vol. 20; no. 7; pp. 1407 - 1427
Main Authors: Pivnick, K.A. (Agriculture Canada, Saskatoon, Saskatchewan, Canada.), Jarvis, B.J, Slater, G.P
Format: Journal Article
Language:English
Published: United States 01-07-1994
Subjects:
BRASSICA JUNCEA
COMPORTAMIENTO
COMPORTEMENT
COMPOSICION QUIMICA
COMPOSITION CHIMIQUE
CONTROL DE INSECTOS
DOSAGE BIOLOGIQUE
ENSAYO
ENSAYO BIOLOGICO
INSECTE NUISIBLE
INSECTOS DANINOS
Lepidoptera
LUTTE ANTIINSECTE
ODEUR
OLOR
PIEGE
PLUTELLA XYLOSTELLA
Plutellidae
TESTAGE
THIOCYANATE
TIOCIANATOS
TRAMPAS
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Summary:Olfactory attraction of female diamondback moths (Plutella xylostella) to odors of intact and homogenized host plants, as well as individual compounds characteristic of host plants, were investigated by behavioral and electrophysiological methods. Moths were attracted to odors of Brassica juncea and B. napus seedlings in a Y-tube bioassay. Solvent fractions of homogenized B. juncea leaves were attractive to moths whether or not isothiocyanates (IC) were present. Moths were attracted in Y-tube bioassays and to field traps baited with individual ICs. Volatiles from B. juncea and B. napus elicited an electroantennogram (EAG) response and were attractive in the Y-tube bioassay. Allyl IC was shown to be the attractive component in homogenized plant volatiles but was found to be virtually absent from intact plant volatiles. Gas chromatographic fractionation of intact plant volatiles revealed a terpene-containing fraction to be most attractive to the moths. We were unable to isolate individual attractive compounds from this fraction. Our results suggest that certain elements of this fraction, possibly in combination, are important olfactory cues for host-plant finding by the diamondback moth with mustard oils playing an important and possibly synergistic role, particularly when plants are damaged
Bibliography:9561704
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ISSN:0098-0331
1573-1561
DOI:10.1007/bf02059870