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Effects of photoperiod on induction of diapause in Feltiella acarisuga (Diptera: Cecidomyiidae)

Published online by Cambridge University Press:  31 May 2012

D.R. Gillespie  and
D.M.J. Quiring
D.R. Gillespie*
Affiliation:
Agriculture and Agri-Food Canada, Pacific Agri-Food Research Centre, PO Box 1000, Agassiz, British Columbia, Canada VOM 1A0
D.M.J. Quiring
Affiliation:
Agriculture and Agri-Food Canada, Pacific Agri-Food Research Centre, PO Box 1000, Agassiz, British Columbia, Canada VOM 1A0
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Larvae of the predatory gall midge Feltiella acarisuga (Vallot) diapaused as prepupae in tightly woven, brown, silk cells on leaf surfaces. Photoperiod alone, at day lengths from 16 to 8 h did not induce diapause at either 20 or 25 °C. A low incidence of diapause was induced by a combined photoperiod and thermoperiod of an 8-h day at 25 °C and a 16-h night at 15 °C. The incidence of diapause was higher under these conditions if the larvae were fed diapausing spider mites, Tetranychus urticae (Koch) (Acari: Tetranychidae). Because F. acarisuga only diapauses at daylengths equivalent to mid-winter, when its prey, T. urticae, is also in diapause, it can be used as a biological control agent for T. urticae in British Columbia greenhouses throughout most of the growing season.

Résumé

Les larves de la cécidomyie prédatrice gallicole Feltiella acarisuga (Vallot) entrent en diapause au stade de prénymphe dans des cellules de soie brune au tissage serré, sur la surface des feuilles. La photopériode seule, de 16 à 8 h de clarté, ne déclenche pas la diapause à 20 ou à 25 °C. Une photopériode et une thermopériode combinées de 8 h de clarté à 25 °C et de 16 h d'obscurité à 15 °C entraînent un faible taux de diapause. La diapause dans ces conditions est plus fréquente lorsque les larves sont nourries d'acariens, Tetranychus urticae (Koch) (Acari : Tetranychidae), en diapause. Parce que la cécidomyie n'entre en diapause que lorsque la longueur des jours équivaut à celle d'une journée du milieu de l'hiver, lorsque sa proie, T. urticae, est aussi en diapause, elle peut servir d'agent de lutte biologique contre T. urticae dans les serres de Colombie-Britannique pendant la plus grande partie de la saison de croissance.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 1 , February 2002 , pp. 69 - 75
Copyright
Copyright © Entomological Society of Canada 2002

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