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Using agronomic traits and semiochemical production in winter wheat cultivars to identify suitable trap crops for the wheat stem sawfly

Published online by Cambridge University Press:  02 April 2012

Micaela Buteler ,
David K. Weaver ,
Phil L. Bruckner ,
Gregg R. Carlson ,
James E. Berg  and
Peggy F. Lamb
Micaela Buteler*
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, 334 Leon Johnson Hall, Bozeman, Montana 59717-3120, United States of America
David K. Weaver
Affiliation:
Department of Land Resources and Environmental Sciences, Montana State University, 334 Leon Johnson Hall, Bozeman, Montana 59717-3120, United States of America
Phil L. Bruckner
Affiliation:
Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, Montana 59717, United States of America
Gregg R. Carlson
Affiliation:
Northern Agricultural Research Center, Montana State University, 3848 Fort Circle, Havre, Montana 59501, United States of America
James E. Berg
Affiliation:
Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, Montana 59717, United States of America
Peggy F. Lamb
Affiliation:
Northern Agricultural Research Center, Montana State University, 3848 Fort Circle, Havre, Montana 59501, United States of America
*
1 Corresponding author (e-mail: micaela.buteler@montana.edu).
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Abstract

Trap crops are a plausible control strategy for the wheat stem sawfly (WSS), Cephus cinctus Norton (Hymenoptera: Cephidae), especially in alternate wheat−fallow cropping systems. Identifying the most suitable winter wheat (Triticum aestivum L., Poaceae) cultivars is necessary to further improve the effectiveness of winter wheat trap crops. We compared cultivars suitable for cultivation in Montana to identify those that exhibit the greatest potential as trap crops. To accomplish this we used nine winter wheat cultivars to analyze plant characteristics that influence the oviposition behavior of the WSS: stem height, stem diameter, rate of plant development, and emission of the WSS attractant (Z)-3-hexenyl acetate. Data on sawfly-induced stem cutting collected from these cultivars in field nurseries were analyzed to evaluate the potential of each cultivar to attract sawflies. Based on these criteria, five cultivars with good potential as trap crops are ‘Norstar’, ‘Neeley’, ‘Morgan’, ‘Rampart’, and ‘BigSky’. More data from laboratory preference tests and detailed measurement of semiochemical production from these cultivars are required for selecting optimal cultivars for trap-cropping.

Résumé

Les cultures pièges peuvent constituer une stratégie de lutte intéressante contre la cèphe du blé (WSS), Cephus cinctus Norton (Hymenoptera: Cephidae), particulièrement dans les systèmes d'alternance de culture de blé et de jachère. Il est cependant nécessaire d'identifier les cultivars de blé d'hiver (Triticum aestivum L., Poaceae) les plus adéquats afin d'améliorer davantage l'efficacité des cultures pièges de blé d'hiver. Nous avons comparé les cultivars appropriés pour la culture au Montana afin d'identifier ceux qui présentent le plus fort potentiel comme cultures pièges. Nous avons, par conséquent, analysé les caractéristiques des plantes qui influencent le comportement de ponte des WSS, la hauteur de la tige, le diamètre de la tige, le taux de développement de la plante et l'émission de l'attractif de la WSS, l'acétate de (Z)-3-hexényle, chez neuf cultivars de blé d'hiver. Nous avons aussi analysé les données sur les tiges coupées par les cèphes chez ces cultivars dans des pépinières de terrain afin d'évaluer le potentiel d'attraction de chaque cultivar pour les cèphes. D’après ces critères, cinq cultivars présentent un potentiel intéressant comme cultures pièges, ce sont ‘Norstar’, ‘Neely’, ‘Morgan’, ‘Rampart’ et BigSky’. Il faudra faire des tests de préférence additionnels en laboratoire et mesurer avec précision la production de substances sémiochimiques pour pouvoir sélectionner les cultivars les plus appropriés pour les cultures pièges.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 142 , Issue 3 , June 2010 , pp. 222 - 233
Copyright
Copyright © Entomological Society of Canada 2010

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