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Evaluating the current integrated pest management recommendations in Canada for carrot weevil (Coleoptera: Curculionidae) and carrot rust fly (Diptera: Psilidae)

Published online by Cambridge University Press:  15 April 2019

Zachariah Telfer Open the ORCID record for Zachariah Telfer [Opens in a new window] ,
Jason Lemay ,
Mary Ruth McDonald  and
Cynthia Scott-Dupree
Zachariah Telfer*
Affiliation:
School of Environmental Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
Jason Lemay
Affiliation:
Department of Plant Agriculture, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada
Mary Ruth McDonald
Affiliation:
Department of Plant Agriculture, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada
Cynthia Scott-Dupree
Affiliation:
School of Environmental Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
*
1Corresponding author (e-mail: ztelfer@uoguelph.ca)
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Abstract

The primary insect pests in Canadian carrot production are carrot rust fly (Psila rosae (Fabricius); Diptera: Psilidae) and carrot weevil (Listronotus oregonensis (LeConte); Coleoptera: Curculionidae). An integrated pest management programme for these pests exists in Québec and Ontario, where most Canadian carrot (Daucus carota subsp. sativus (Hoffmann) Schübler and Martens; Apiaceae) production occurs. As current carrot insect integrated pest management recommendations are decades old, laboratory and field trials were performed to evaluate the carrot insect integrated pest management recommendations. Carrot weevil populations were evaluated in the laboratory for resistance to the primary product used for control, phosmet. Ontario carrot weevils exhibited negligible mortality when exposed to phosmet compared with > 80% mortality in a susceptible strain. Using data from a carrot integrated pest management programme, weather data was correlated with monitoring and damage data of both pests from historical records. Increased carrot weevil captures were weakly related to increased damage. Carrot weevil damage was reduced by following integrated pest management recommendations in one of three trials. No strong relationship between weather and carrot rust fly captures was identified, suggesting the degree day model for carrot rust fly activity needs revision. In field trials, carrot rust fly damage was negligible despite integrated pest management recommendations for insecticide applications. Future research should include improving carrot weevil monitoring and control and increasing the carrot rust fly action threshold to optimise insecticide applications.

Type
Insect Management
Information
The Canadian Entomologist , Volume 151 , Issue 3 , June 2019 , pp. 391 - 405
Copyright
© Entomological Society of Canada 2019 

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Footnotes

Subject editor: Matthew O’Neal

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