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Occurrence of Sitodiplosis mosellana (Diptera: Cecidomyiidae) and its parasitoid, Macroglenes penetrans (Hymenoptera: Platygasteridae), in northeastern Montana

Published online by Cambridge University Press:  02 April 2012

Thomas G. Shanower
Thomas G. Shanower
Affiliation:
USDA–ARS Northern Plains Agricultural Research Laboratory, 1500 North Central Avenue, Sidney, Montana 59270, United States of America (e-mail: tshanower@sidney.ars.usda.gov)
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Abstract

The wheat midge, Sitodiplosis mosellana (Géhin), is an infrequent but devastating pest that has been present in western North America for at least 100 years. This note provides the first published report of the presence of the wheat midge and its parasitoid, Macroglenes penetrans (Kirby), in Montana. Annual surveys were conducted in Daniels, Roosevelt, Sheridan, and Valley counties of northeastern Montana for 5 years (2000–2004) using a systematic soil sampling method to collect overwintering wheat midge larvae. In addition, in 2004, infested wheat heads were collected from 10 fields in Sheridan County, and wheat midges and parasitoids were reared. The wheat midge occurred in all four counties, though at relatively low levels. Densities fluctuated across years and locations, with the highest densities (>200 midge larvae/m2) occurring in Sheridan and Roosevelt counties. Macroglenes penetrans was found at all 10 sample sites and constituted up to 52% of the emerged adults (midges + parasitoids).

Résumé

La cécidomyie du blé, Sitodiplosis mosellana (Géhin), est un ravageur peu fréquent mais dévastateur qui est présent dans l'ouest de l'Amérique du Nord depuis au moins 100 ans. Ceci est la première mention publiée de la présence de la cécidomyie du blé et de son parasitoïde Macroglenes penetrans (Kirby) au Montana. Des inventaires annuels ont été réalisés dans des comtés de Daniels, Roosevelt, Sheridan et Valley du nord-est du Montana pendant 5 ans (2000–2004) à l'aide d'une méthode systématique de prélèvement des sols pour récolter des larves de la cécidomyie du blé qui y hivernent. De plus, en 2004, des épis de blé infestés ont été récoltés dans 10 champs dans le comté de Sheridan et les cécidomyies du blé et leurs parasitoïdes ont été mis en élevage. La cécidomyie du blé se retrouve dans les quatre comtés, bien qu'en nombres réduits. Les densités varient en fonction des années et des sites et les densités les plus fortes (>200 larves de cécidomyies/m2) s'observent dans les comtés de Sheridan et de Roosevelt. Macroglenes penetrans est présent dans les 10 sites d'échantillonnage et représente jusqu'à 52 % des adultes (cécidomyies et parasitoïdes) qui émergent.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 137 , Issue 6 , December 2005 , pp. 753 - 755
Copyright
Copyright © Entomological Society of Canada 2005

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