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Relative attractiveness of colour traps to pear psylla in relation to seasonal changes in pear phenology

Published online by Cambridge University Press:  02 April 2012

W.R. Cooper ,
G.J. Puterka  and
D.M. Glenn
W.R. Cooper*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Western Integrated Cropping Systems Research Unit, 17053 North Shafter Avenue, Shafter, California 93263, United States of America
G.J. Puterka
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Wheat, Peanuts, and Other Field Crops Research Unit, 1301 North Western Road, Stillwater, Oklahoma 74075, United States of America
D.M. Glenn
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Appalachian Fruit Research Station, 2217 Wiltshire Road, Kearneysville, West Virginia 25430, United States of America
*
1 Corresponding author (e-mail: [email protected]).
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Abstract

Monitoring of pear psylla (Cacopsylla pyricola (Förster), Hemiptera: Psyllidae) prior to spring bud break could aid in predicting the size of subsequent spring populations and lead to improved proactive management decisions. Yellow traps are commonly used to monitor hemipteran pests including pear psylla, but very little is known regarding seasonal changes in attractiveness of yellow traps or relative attractiveness of colours other than yellow. This study presents seasonal colour-trap preferences of pear psyllas based on pear (Pyrus communis L., Rosaceae) phenological stages in the mid-Atlantic region of the United States of America. Black, blue, brown, clear (colourless), green, orange, red, white, and yellow traps were assayed against wild adult psylla populations over a 2-year period. Pear psyllas had a strong preference for yellow and orange when green leaves were present; however, we found no statistically significant difference between traps of different colours prior to spring bud break. Significantly more female psyllas were caught overall, but there was no gender-based colour bias. None of our colour traps caught significantly fewer psyllas than did clear (background hue) traps, suggesting that no traps were repellent.

Résumé

La surveillance des psylles du poirier (Cacopsylla pyricola (Förster), Hemiptera : Psyllidae) avant l'éclosion printanière des bourgeons pourrait aider à prédire les populations subséquentes du printemps et permettre une amélioration des décisions proactives de gestion. On utilise généralement des pièges jaunes pour la surveillance des hémiptères ravageurs, y compris du psylle du poirier, bien qu’on connaisse peu les changements saisonniers dans l'attraction des pièges jaunes ou l'attraction relative des couleurs autres que le jaune. Notre étude présente les préférences saisonnières pour les pièges de couleur chez le psylle du poirier en fonction des stades phénologiques du poirier (Pyrus communis L., Rosaceae) dans la région atlantique moyenne des États-Unis. Nous avons fait l'essai de pièges de couleur noire, bleue, brune, claire, verte, orangée, rouge, blanche et jaune avec les populations sauvages de psylles du poirier pendant une période de deux ans. Les psylles du poirier montrent une forte préférence pour le jaune ou l'orangé lorsque les feuilles vertes sont présentes, mais il n’y a pas de différence significative entre les pièges de couleur avant l'éclosion printanière des bourgeons. Il y a globalement une plus forte capture de femelles, mais il n’y a pas de préférence particulière de couleur en fonction du sexe. Aucun de nos pièges de couleur ne récolte significativement moins de psylles que les pièges clairs (teinte de fond), ce qui laisse croire qu’aucun des pièges n’est répulsif.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 142 , Issue 2 , April 2010 , pp. 188 - 191
Copyright
Copyright © Entomological Society of Canada 2010

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