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Behaviour of Sitodiplosis mosellana (Diptera: Cecidomyiidae) on spring wheat spikes with and without oviposition deterrence

Published online by Cambridge University Press:  02 April 2012

A.H. Gharalari ,
M.A.H. Smith ,
S.L. Fox  and
R.J. Lamb
A.H. Gharalari
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
M.A.H. Smith*
Affiliation:
Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
S.L. Fox
Affiliation:
Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
R.J. Lamb
Affiliation:
Cereal Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
*
2 Corresponding author (e-mail: [email protected]).
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Abstract

Wheat, Triticum L. (Poaceae), varieties with deterrence to oviposition by the wheat midge, Sitodiplosis mosellana (Géhin) (Diptera: Cecidomyiidae), can be useful in reducing seed damage. The behaviour of ovipositing females on spring wheat, T. aestivum L., with and without oviposition deterrence was investigated to account for observed differences in oviposition on deterrent and nondeterrent hosts. On deterrent wheat, 34% of females landing oviposited compared with 100% of females landing on nondeterrent wheat. The sequence of female behaviours just prior to egg-laying on deterrent spikes was similar to that on nondeterrent spikes. The length of time required to lay an egg and mean egg-batch size were similar on deterrent and nondeterrent wheat, but females spent nearly twice as long on the latter. After landing on deterrent wheat, females took longer to begin ovipositing and longer to leave after the last oviposition event than did females on nondeterrent wheat, which further reduced the time available for oviposition on deterrent compared with nondeterrent wheat. As a result of these behavioural differences, deterrence reduced oviposition by more than 60%.

Résumé

Les variétés de blé, Triticum L. (Poaceae), qui possèdent des mécanismes de dissuasion de la ponte par la cécidomyie du blé, Sitodiplosis mosellana (Géhin) (Diptera: Cecidomyiidae), peuvent être utiles pour réduire le dommage aux graines. Nous avons examiné le comportement de ponte de femelles sur du blé de printemps, T. aestivum L., avec ou sans mécanismes de dissuasion, afin d'expliquer les différences de ponte observées sur les hôtes qui possèdent ou non ces mécanismes de dissuasion. Trente-quatre pour cent des femelles qui se posent sur le blé avec mécanismes de dissuasion pondent, alors que 100% de celles qui arrivent sur le blé sans mécanismes de dissuasion déposent des œufs. Les séquences des comportements des femelles juste avant et durant la ponte sont semblables sur les épis avec et sans mécanismes de dissuasion. Le temps nécessaire pour la ponte d'un œuf et la taille moyenne des masses d'œufs sont semblables, mais les femelles passent presque deux fois plus de temps sur le blé sans mécanismes de dissuasion que sur le blé qui en possède. Après s’être posées sur du blé avec mécanismes de dissuasion, les femelles mettent plus de temps avant de pondre et y demeurent plus longtemps après la dernière ponte que les femelles sur le blé sans mécanismes de dissuasion, ce qui réduit encore plus le temps disponible pour la ponte sur le blé avec mécanismes de dissuasion par comparaison au blé sans mécanismes de dissuasion. À cause de ces différences comportementales, la dissuasion réduit la ponte de plus de 60%.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 142 , Issue 6 , December 2010 , pp. 574 - 583
Copyright
Copyright © Entomological Society of Canada 2010

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