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Variation of Lygus species assemblages in canola agroecosystems in relation to ecoregion and crop stage

Published online by Cambridge University Press:  31 May 2012

H. Cárcamo ,
J. Otani ,
C. Herle ,
M. Dolinski ,
L. Dosdall ,
P. Mason ,
R. Butts ,
L. Kaminski  and
O. Olfert
H. Cárcamo*
Affiliation:
Lethbridge Research Centre, Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1
J. Otani
Affiliation:
Beaverlodge Research Farm, Agriculture and Agri-Food Canada, Beaverlodge, Alberta, Canada T0H 0C0
C. Herle
Affiliation:
Lethbridge Research Centre, Agriculture and Agri-Food Canada, PO Box 3000, Lethbridge, Alberta, Canada T1J 4B1
M. Dolinski
Affiliation:
Alberta Agriculture Food and Rural Development, 7000 – 113 Street Northwest, Edmonton, Alberta, Canada T6H 5T6
L. Dosdall
Affiliation:
Alberta Agriculture Food and Rural Development, 7000 – 113 Street Northwest, Edmonton, Alberta, Canada T6H 5T6
P. Mason
Affiliation:
Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, KW Neatby Building, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
R. Butts
Affiliation:
Potato Research Centre, Agriculture and Agri-Food Canada, 850 Lincoln Road, PO Box 20280, Fredericton, New Brunswick, Canada E3B 4Z7
L. Kaminski
Affiliation:
Saskatoon Research Centre, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, Saskatchewan, Canada S7N 0X2
O. Olfert
Affiliation:
Saskatoon Research Centre, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, Saskatchewan, Canada S7N 0X2
*
1Corresponding author (e-mail: carcamoh@em.agr.ca).
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Abstract

Plant bugs in the genus Lygus (Hahn) (Hemiptera: Miridae) are sporadic pests of canola, Brassica napus L. (Brassicaceae) and Brassica rapa L., in western Canada and infestations appear to have become increasingly common and severe in recent years. Surveys conducted from 1998 to 2000 identified a "northern" assemblage in the boreal ecoregion that was dominated by Lygus lineolaris (Palisot de Beauvois), with minor representation of Lygus borealis (Kelton), Lygus elisus (Van Duzee), and Lygus keltoni (Schwartz). A "southern" assemblage in the grassland ecoregions was dominated by L. keltoni, with a substantial abundance of L. elisus and L. borealis and with few L. lineolaris in the driest areas. The assemblage from the parkland ecoregion was variable but with few L. elisus. The boreal plains and parkland ecoregions of Alberta had the most serious and persistent infestations of Lygus spp. Relative species composition of the Lygus assemblage at the bolting stage was not related to the overall abundance of these bugs at the early pod stage. Lygus species assemblages were similar in terms of composition and relative abundance at the bolting and early pod stages of canola. A shift in species proportions in favour of L. lineolaris in the north and L. keltoni in the south and a decrease of L. elisus has taken place relative to studies conducted in the 1980's.

Résumé

Les punaises des plantes du genre Lygus (Hahn) (Hemiptera : Miridae) attaquent sporadiquement les cultures de colza, Brassica napus L. (Brassicaceae) et Brassica rapa L., dans l'Ouest canadien et les infestations semblent être devenues plus fréquentes et plus dévastatrices au cours des dernières années. Des inventaires en 1998–2000 ont permis de reconnaître dans la région boréale une « association nordique » dominée par Lygus lineolaris (Palisot de Beauvois) et formée également de petits nombres de Lygus borealis (Kelton), Lygus elisus (Van Duzee) et Lygus keltoni (Schwartz). Une « association méridionale », dans les prairies, était dominée par L. keltoni, L. elisus et L. borealis y étaient relativement abondants et de petits nombres de L. lineolaris habitaient les régions les plus sèches. L'association de l'écorégion des tremblaies-parcs était variable et comptait peu de L. elisus. C'est dans les écorégions des plaines boréales et des tremblaies-parcs d'Alberta qu'ont sévi les infestations les plus graves et les plus persistantes de Lygus spp. La composition relative des espèces dans les associations de Lygus au stade de la montée en graines n'était pas reliée à l'abondance globale des punaises au début de la formation des gousses. Au moment de la montée en graines et au stade de formation des gousses de colza, la composition et l'abondance relative des associations d'espèces de Lygus étaient similaires. Il s'est produit une augmentation de L. lineolaris dans le nord et de L. keltoni dans le sud, ainsi qu'une diminution de L. elisus comparativement aux résultats d'une étude faite dans les années 1980.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 1 , February 2002 , pp. 97 - 111
Copyright
Copyright © Entomological Society of Canada 2002

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