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Attraction of male summerform pear psylla to volatiles from female pear psylla: effects of female age, mating status, and presence of host plant

Published online by Cambridge University Press:  02 April 2012

David R. Horton ,
Christelle Guédot  and
Peter J. Landolt
David R. Horton*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 5230 Konnowac Pass Road, Wapato, Washington 98951, United States of America
Christelle Guédot
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 5230 Konnowac Pass Road, Wapato, Washington 98951, United States of America
Peter J. Landolt
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 5230 Konnowac Pass Road, Wapato, Washington 98951, United States of America
*
1Corresponding author (e-mail: david.horton@ars.usda.gov).
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Abstract

Pear psylla, Cacopsylla pyricola (Förster) (Hemiptera: Psyllidae), is a pest of pears, Pyrus L. (Rosaceae), throughout North America and western Europe. Previous studies in our laboratory showed that males of the overwintering form (winter morphotype) were attracted to volatile chemicals from pear shoots infested with post-diapause females. The current study shows that males of the summer morphotype also are attracted to volatiles from female-infested host material. Older females (8–10 d old) were significantly more attractive to males than younger (2–5 d old) females. Both virgin and mated females attracted male psylla. Volatiles from female summerforms attracted males even in the absence of host-plant material, and both living and freshly killed females were attractive. Our results indicate that female C. pyricola emit a volatile sex attractant, and the results of the studies further define the life-history conditions in female pear psylla that lead to male attraction.

Résumé

Le psylle du poirier, Cacopsylla pyricola (Förster) (Hemiptera: Psyllidae), est un ravageur du poirier dans toute l’Amérique du Nord et l’Europe de l’Ouest. Des études antérieures dans notre laboratoire ont montré que les mâles de la forme hivernante (morphotype d’hiver) sont attirés par les substances volatiles émises par les pousses de poiriers infestées par des femelles au stade post-diapause. La présente étude montre que les mâles du morphotype d’été sont aussi attirés par les substances volatiles émises par les plantes hôtes infestées par les femelles. Les femelles plus âgées (8–10 j d’âge) sont significativement plus attirantes pour les mâles que les femelles plus jeunes (2–5 j d’âge). Tant les femelles vierges que les accouplées attirent les psylles mâles. Les substances volatiles émises par les femelles de la forme d’été attirent les mâles, même en l’absence de tissus de la plante hôte; de même, les femelles vivantes et celles qui sont fraîchement tuées sont attirantes. Nos travaux indiquent que les femelles de C. pyricola émettent une substance attractive sexuelle volatile et ils déterminent les conditions du cycle biologique des femelles du psylle du poirier qui provoquent l’attraction des mâles.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 140 , Issue 2 , April 2008 , pp. 184 - 191
Copyright
Copyright © Entomological Society of Canada 2008

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