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PREOVIPOSITION AND OVIPOSITION PERIODS OF THE APPLE MAGGOT, RHAGOLETIS POMONELLA (DIPTERA: TEPHRITIDAE)1

Published online by Cambridge University Press:  31 May 2012

W. T. A. Neilson ,
A. D. Knowlton  and
K. B. McRae
W. T. A. Neilson
Affiliation:
Research Station, Agriculture Canada, Kentville, Nova Scotia B4N 1J5
A. D. Knowlton
Affiliation:
Research Station, Agriculture Canada, Kentville, Nova Scotia B4N 1J5
K. B. McRae
Affiliation:
Research Station, Agriculture Canada, Kentville, Nova Scotia B4N 1J5
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Abstract

The preoviposition period of R. pomonella (Walsh) varied from 5 to 11 days at constant and 6 to 15 days at variable rearing conditions. Its duration was influenced by the source of the adults, cultivars for oviposition, and rearing conditions: ca. 3 days longer for adults from infested Wealthy apples than for adults from infested Gravensteins, ca. 2 days longer when the apples for oviposition were late season cultivars, and ca. 1 day longer at variable than at constant rearing conditions. Estimates of the preoviposition period of adults in two unsprayed orchards were 14 and 21 days in 1979 and 16 days in both orchards in 1980, and were 7–14 days longer than that for adults at constant rearing conditions.

The oviposition periods of adults were 40–74 days at constant and 25–55 days at variable rearing conditions in 1979, and were influenced by the source of the adults, cultivars for oviposition, and the rearing conditions. Females from infested Gravensteins laid 339.2 and 180.7 eggs/female at constant and variable conditions and those from infested Wealthy 178.4 and 68.8 eggs/female at constant and variable conditions. Females also laid fewer eggs in Red Delicious apples than in Gravenstein, McIntosh, or Cortland apples.

The first spray for control of apple maggot in Nova Scotia can be applied at least 14 days after first emergence or first capture as the preoviposition period in natural (orchard) conditions exceeded the recommended time of 7–10 days.

Résumé

La période de préponte de la mouche de la pomme, Rhagoletis pomonella (Walsh), varie de 5 à 10 jours et de 6 à 15 jours dans des conditions d’élevage constantes et variables respectivement. Sa durée est fonction de l’origine des adultes, des cultivars de pommier pour la ponte et des conditions d’élevage, soit d’environ 3 jours plus longue pour les adultes provenant de pommes Wealthy infestées que pour ceux issus de Gravenstein, d’environ 2 jours plus longue lorsque les pommes sont des cultivars tardifs et d’environ 1 jour plus longue dans des conditions variables que constantes. Les estimations de la période de préponte des adultes de deux vergers non traités ont été de 14 et 21 jours en 1979, et de 16 jours dans les deux cas en 1980, et furent de 7 à 14 jours plus longues que celles des adultes élevés dans des conditions constantes.

Les périodes de ponte des adultes élevés dans des conditions constantes et variables ont été de 40 à 74 et de 25 à 55 jours respectivement en 1979 et furent tributaires de l’origine des adultes, des cultivars de pommier et des conditions d’élevage. Les femelles des Gravenstein ont déposé 339,2 et 180,7 œufs chacune dans des conditions constantes et variables respectivement, contre 178,4 et 68,8 œufs pour celles des Wealthy. Les femelles ont aussi pondu moins d’œufs dans les Red Delicious que dans les Gravenstein, Mcintosh ou Cortland.

La première pulvérisation de lutte contre la mouche de la pomme en Nouvelle-Écosse peut se faire au moins 14 jours après la première émergence ou capture car la période de préponte dans les vergers dépasse le délai recommandé de 7 à 10 jours.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 12 , December 1981 , pp. 1061 - 1067
Copyright
Copyright © Entomological Society of Canada 1981

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