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SEASONAL OCCURRENCE AND CHEMICAL CONTROL OF THE BROMEGRASS SEED MIDGE, CONTARINIA BROMICOLA (DIPTERA: CECIDOMYHDAE), IN SASKATCHEWAN

Published online by Cambridge University Press:  31 May 2012

P. S. Curry ,
R. P. Knowles  and
J. Waddington
P. S. Curry
Affiliation:
Canada Department of Agriculture
R. P. Knowles
Affiliation:
Canada Department of Agriculture
J. Waddington
Affiliation:
Canada Department of Agriculture
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Abstract

Populations of the bromegrass seed midge, Contarinia bromicola Marikovskiy and Agafonova, were sampled in bromegrass plots in Saskatchewan in the years 1974 to 1980 inclusive. Two peaks of midge adult numbers were observed, the first at bromegrass heading time in early June and the second about 20–25 days later at bromegrass flowering. Parasitism by a species of Tetrastichus (Eulophidae) varied from 30% to 75%. Carbofuran (0.14 kg A.I./ha) or dimethoate (0.56 kg A.I./ha) spray, applied just before emergence of adult midges at flowering time, significantly reduced numbers of midges and parasites resident in the plants in both of two field tests; a second generation of midge larvae, following invasion by midge adults, was significantly reduced by residual treatment effect in only 1 of the 2 years.

Résumé

De 1974 à 1980 inclusivement, on a échantillonné des populations de cécidomyie du brome, Contarinia bromicola Marikovskiy et Agafonova, dans des parcelles de brome en Saskatchewan. On observe deux pics de densité de population des adultes, le premier au stade de l'épiaison du brome au début de juin, et le second environ 10 à 25 jours plus tard au stade de la floraison. Le parasitisme par une espèce de Tetrastichus (Eulophidae) varie de 30 à 75%. Une pulvérisation de carbofuran (0.14 kg de m.a./ha) ou de diméthoate (0.56 kg de m.a./ha), appliquée juste avant l'émergence des adultes à la floraison, réduit significativement les effectifs de cécidomyies et de parasites inféodés aux plantes, et ce, dans les deux essais effectués en plein champ; une seconde génération de larves de cécidomyie, après invasion par des adultes venant de l'extérieur, n'est significativement réduite par effet résiduel des traitements que dans l'une des deux années d'essais.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 1 , January 1983 , pp. 75 - 79
Copyright
Copyright © Entomological Society of Canada 1983

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References

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