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Oviposition deterrence against Sitodiplosis mosellana (Diptera: Cecidomyiidae) in spring wheat (Gramineae)1

Published online by Cambridge University Press:  31 May 2012

R.J. Lamb ,
I.L. Wise ,
M.A.H. Smith ,
R.I.H. McKenzie ,
J. Thomas  and
O.O. Olfert
R.J. Lamb*
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
M.A.H. Smith
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
R.I.H. McKenzie
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
J. Thomas
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
O.O. Olfert
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N 0X2
*
2Corresponding author (e-mail: rlamb@em.agr.ca).
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Abstract

Spring wheats, Triticum aestivum L., previously identified as being lightly infested by eggs or larvae of wheat midge, Sitodiplosis mosellana (Géhin), were tested to determine if reduced infestation was the result of oviposition deterrence. Oviposition deterrence was measured as the number of eggs deposited on a wheat line relative to that on a check. Egg densities on some of these lines were 10% or less compared with the susceptible commercial cultivar 'Roblin' in choice tests and 20% or less in no-choice tests in the laboratory. These lines also deterred oviposition in the field, reducing egg densities by at least 50% in single-row and multi-row field plots. Other experimental lines showed levels of oviposition deterrence intermediate between the most deterrent lines and 'Roblin'. One of 12 commercial cultivars tested, 'AC Superb', also had low egg densities in the laboratory and in single-row field tests, but this possible oviposition deterrence was not consistently present in large plots or commercial fields. The most deterrent experimental lines showed a level of oviposition deterrence that would be agriculturally useful and desirable in combination with a previously described antibiotic resistance.

Résumé

Du blé de printemps, Triticum aestivum L., préalablement reconnu comme porteur de légères infestations d'oeufs et de larves de la Cécidomyiie du blé, Sitodiplosis mosellana (Géhin), a été testé dans le but de déterminer si la réduction des infestations peut être attribuable à une inhibition de la ponte. Le nombre d'oeufs pondus sur une variété de blé par rapport au nombre trouvé sur une variété témoin a servi de mesure de l'inhibition de la ponte. La densité des oeufs sur certaine de ces variétés équivalait à 10% ou moins de celle sur le cultivar commercial sensible « Roblin » au cours de tests de choix et à 20% ou moins de celle enregistrée au cours de tests sans choix en laboratoire. Ces variétés inhibent également la ponte en nature et réduisent la densité des oeufs d'au moins 50% dans les champs à rangées simples et à rangées multiples. D'autres variétés expérimentales avaient des taux d'inhibition de la ponte intermédiaires entre les variétés les plus inhibitrices et le cultivar « Roblin ». L'un des 12 cultivars commerciaux utilisés le cultivar « AC Superb » a également donné lieu à des densités d'oeufs faibles en laboratoire et lors des tests en rangées simples en nature, mais cette inhibition ne s'est pas manifestée de façon constante dans les grandes parcelles ou dans les champs commerciaux. Les variétés expérimentales les plus inhibitrices ont des taux d'inhibition de la ponte qui pourraient s'avérer utiles en agriculture et même souhaitables lorsque combinés à une résistance aux antibiotiques décrite précédemment.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 1 , February 2002 , pp. 85 - 96
Copyright
Copyright © Entomological Society of Canada 2002

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Footnotes

1

Contribution No. 1800 of the Cereal Research Centre, Winnipeg, Manitoba.

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