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First Nearctic record of the swede midge (Diptera: Cecidomyiidae), a pest of cruciferous crops from Europe

Published online by Cambridge University Press:  31 May 2012

Rebecca H. Hallett  and
James D. Heal
Rebecca H. Hallett*
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
James D. Heal
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
*
1 Author to whom all correspondence should be addressed (E-mail: [email protected]).
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Extract

In 1996, damage symptoms typical of the swede midge, Contarinia nasturtii (Keiffer), were observed on broccoli, Brassica oleracea L. var. italica (Brassicaceae), crops east of Toronto, Ontario. Early attempts to identify an associated insect larva were unsuccessful, and damage symptoms became mistakenly attributed to nutrient deficiencies (T Clarke, personal communication). Between 1996 and 1999, damaged plants were seen by growers regularly, and resulted in up to 85% loss of marketable yield (T Clarke, personal communication). In June 2000, we initiated investigations at two sites 12 km apart to determine the causal organism of this damage. Both sites were located at farms where cole crops are primarily -gown and from where the first damage reports originated.

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 5 , October 2001 , pp. 713 - 715
Copyright
Copyright © Entomological Society of Canada 2001

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References

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