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THE WHEAT BULB FLY, DELIA COARCTATA, IN NORTH AMERICA (DIPTERA: ANTHOMYIIDAE)

Published online by Cambridge University Press:  31 May 2012

J. F. McAlpine  and
C. Slight
J. F. McAlpine
Affiliation:
Biosystematics Research Institute, Agriculture Canada, Ottawa K1A 0C6
C. Slight
Affiliation:
Food Production and Inspection Branch, Agriculture Canada, Ottawa K1A 0C6
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Abstract

The wheat bulb fly, Delia coarctata (Fallén), a widespread Eurasian species, is recorded for the first time from Quebec, New Brunswick, Prince Edward Island, Nova Scotia, and Maine. Unlike most Anthomyiidae, this species overwinters in the egg stage in the soil. Hatching occurs in early spring, and young larvae attack the roots of fall-germinated grasses. The primary host is couch grass, Agropyron repens (Linnaeus). In Europe, however, D. coarctata is an important pest of winter wheat, and workers in North America are alerted to its potential economic importance here. Adults may be distinguished from other root maggot flies by a combination of characters which includes the plumosity of the arista, the setation of the thorax and legs, the colour of the wings and legs, and most importantly, the details of the male and female terminalia.

Résumé

Delia coarctata (Fallén) (wheat bulb fly) est une espèce largement répandue dans la région eurasiatique. Elle est signalée ici pour la première fois du Québec, Nouveau-Brunswick, Ile-du-Prince-Edouard, Nouvelle-Ecosse et Maine. Contrairement aux autres Anthomyiidae, elle hiberne dans le sol au stade de l’œuf. L’éclosion a lieu tôt au printemps et les jeunes larves s’attaquent aux racines des graminées ayant germé l’automne précédent. L’hôte principal est Agropyron repens (Linné). En Europe, cependant, D. coarctata est un important parasite du blé d’hiver, et les chercheurs nord-américains devraient être conscients de son importance économique potentielle chez nous. Les adultes peuvent être distingués des autres Anthomyiides par une série de caractères dont la plumosité de l’arista, la chaetotaxie du thorax et des pattes, la couleur des ailes et des pattes, et surtout, les détails des génitalia des deux sexes.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 7 , July 1981 , pp. 615 - 621
Copyright
Copyright © Entomological Society of Canada 1981

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References

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