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Oviposition deterrence to Sitodiplosis mosellana (Diptera: Cecidomyiidae): a source of resistance for durum wheat (Gramineae)1

Published online by Cambridge University Press:  31 May 2012

R.J. Lamb ,
M.A.H. Smith ,
I.L. Wise ,
P. Clarke  and
J. Clarke
R.J. Lamb*
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
M.A.H. Smith
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
I.L. Wise
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
P. Clarke
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
J. Clarke
Affiliation:
Semi-Arid Prairie Agriculture Research Centre, Agriculture and Agri-Food Canada, PO Box 1030, Swift Current, Saskatchewan, Canada S9H 3X2
*
2 Author to whom all correspondence should be addressed (E-mail: rlamb@em.agr.ca).
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Abstract

Over 250 durum wheats, Triticum durum Desf., and close relatives were screened for resistance to the wheat midge, Sitodiplosis mosellana (Géhin). Less than 2% showed consistently reduced egg and larval densities in field and laboratory trials. Two related accessions named ’Kahla’ had stable, low larval infestation levels, which were about 30% of those in commercial durum wheat cultivars. No antibiosis was detected in durum wheats. The reduction in infestation by larvae was associated with a similar reduction in oviposition. The resistance reduced egg densities by 80% or more in choice and no-choice laboratory tests and by about 70% in the field. Egg group size was not affected, and therefore reduced oviposition must have resulted from the number of egg groups deposited by females. The resistance was not associated with any of 12 morphological traits that were quantified for spikes. ’Kahla’ is the first durum wheat identified to have resistance against the wheat midge.

Résumé

La résistance à la Cécidomyiie du blé, Sitodiplosis mosellana (Géhin), a été évaluée chez plus de 250 blés durs, Triticum durum Desf., et chez d’autres plantes fortement apparentées. La densité des oeufs et des larves n’a diminué de façon systématique que chez moins de 2% des plantes, en nature et en laboratoire. Deux accessions apparentées connues sous l’appellation de « Kahla » se sont révélées avoir des taux d’infestation de larves faibles et stables, équivalant à environ 30% des taux d’infestation des cultivars de blé dur commercial. Aucune antibiose n’a été observée chez les blés durs. La réduction de l’infestation de larves était associée à une réduction correspondante de la ponte. La résistance a réduit la densité des oeufs de 80% ou plus au cours de tests de choix et de tests sans choix en laboratoire et d’environ 70% en nature. Le nombre d’oeufs dans les groupes ne variait pas et on peut donc attribuer la réduction de la ponte à une réduction du nombre de masses d’oeufs pondues par les femelles. Il n’y avait pas de corrélation entre la résistance et 12 caractéristiques morphologiques mesurées sur les épis. Le « Kahla » est le premier blé dur à s’avérer résistant à la Cécidomyiie du blé.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 4 , August 2001 , pp. 579 - 591
Copyright
Copyright © Entomological Society of Canada 2001

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Footnotes

1

Contribution No. 1798 of the Cereal Research Centre, Winnipeg, Manitoba.

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