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INFLUENCE OF PREPUPATION ENVIRONMENT ON DIAPAUSE INDUCTION IN THE CARROT RUST FLY, PSILA ROSAE (FAB.) (DIPTERA: PSILIDAE)

Published online by Cambridge University Press:  31 May 2012

A.B. Stevenson  and
E.S. Barszcz
A.B. Stevenson
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
E.S. Barszcz
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
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Abstract

When carrot rust fly, Psila rosae (Fab.), collected as mature third-instar larvae on three dates in each fall of 3 years from carrots from the Holland Marsh, Ont., pupated in the laboratory at 10°C, the intensity of the diapause induced was lower in the samples collected latest in the season. Similarly, the latest pupating cohorts of pupae formed in the field exhibited less intense diapause and developed more rapidly at 20°C in the fall or the following spring. When larvae were kept at 1 or −2°C for varying periods before pupation at 10°C, the incidence and intensity of the pupal diapause decreased with increasing duration of exposure to the low temperatures. Larvae held at 5°C pupated in less than 60 days and entered diapause. Transfer of puparia from 20 to 10°C at various stages of pupation showed that diapause was induced if pupae were transferred less than 48 h after formation of the pupa was first evident.

Résumé

Au moment de la nymphose au laboratoire à 10°C des larves de la mouche de la carotte, Psila rosae (Fab.), ramassées comme larves à l’échéance du troisième stade, à trois dates à l’automne de 3 années, sur les carottes du Holland Marsh, Ontario, l’intensité de la diapause induite a été moins pour les échantillons ramassés au plus tard dans la saison que pour les autres. Aussi, les cohortes qui sont devenues nymphes sur le terrain au plus tard dans la saison ont démontré une diapause moins intense que les autres et se sont développées plus vite qu’elles à 20°C à l’automne ou au printemps. Pour les larves, tenues à 1 ou à −2°C pendant les périodes de durées inégales avant la nymphose à 10°C, la fréquence et l’intensité de la diapause de la nymphe ont diminué à mesure que l’exposition aux basses températures a augmenté. Les larves tenues à 5°C ont fait des nymphes en moins de 60 jours et sont entrées dans la diapause. Le transfert de pupes de 20 à 10°C pendant des stades différents de la nymphose a démontré que la diapause s’est induite, si les nymphes ont été transférées moins de 48 h après la première indication de leurs formations.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 1 , February 1991 , pp. 41 - 53
Copyright
Copyright © Entomological Society of Canada 1991

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