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Degree-day models to predict carrot weevil (Coleoptera: Curculionidae) emergence and oviposition in Nova Scotia, Canada

Published online by Cambridge University Press:  09 April 2020

Suzanne Blatt*
Affiliation:
Agriculture & Agri-Food Canada, Kentville Research and Development Centre, Kentville, Nova Scotia, B4N 1J5, Canada
Deney Augustine Joseph
Affiliation:
Department of Plant, Food and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, Nova Scotia, B2N 5E3, Canada
G. Christopher Cutler
Affiliation:
Department of Plant, Food and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, Nova Scotia, B2N 5E3, Canada
A. Randall Olson
Affiliation:
Department of Plant, Food and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, Nova Scotia, B2N 5E3, Canada
Scott White
Affiliation:
Department of Plant, Food and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, Nova Scotia, B2N 5E3, Canada
*
*Corresponding author. Email: suzanne.blatt@canada.ca

Abstract

Carrot weevil, Listronotus oregonensis (LeConte) (Coleoptera: Curculionidae), is a pest of carrot (Daucus carota var. sativus Hoffmann; Apiaceae) throughout eastern Canada. Carrot weevil emergence and oviposition were monitored in commercial carrot fields in Nova Scotia. Cumulative degree days were calculated using a base temperature of 7 °C (DD7), and models were developed to predict cumulative emergence and oviposition using nonlinear regression. Cumulative emergence and oviposition were adequately explained as functions of DD7 by a three-parameter sigmoidal Hill equation. Our emergence model predicted initial and peak adult emergence at 35 and 387 DD7, respectively, with oviposition on carrot baits occurring as early as 42 DD7. Models were then validated to evaluate how well they performed. Oviposition on carrot plants began at the fourth true-leaf stage (342 DD7) and continued until eleventh true-leaf stage. Growers using these models can identify their window of opportunity to manage their carrot weevil populations targeting the majority of emerged adults before oviposition begins in the field.

Type
Research Papers
Creative Commons
Creative Common License - CCCreative Common License - BY
Parts of this are a work of Her Majesty the Queen in Right of Canada.
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of The Entomological Society of Canada

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Footnotes

Subject editor: Hervé Colinet

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