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OBSERVATIONS ON RHOPALOSIPHUM PADI AND R. FITCHII (HOMOPTERA: APHIDIDAE) IN MANITOBA

Published online by Cambridge University Press:  31 May 2012

A. G. Robinson  and
Ya-Hwai Chen
A. G. Robinson
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg
Ya-Hwai Chen
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg
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Abstract

The summer forms of two aphids, Rhopalosiphum padi (L.) and R. fitchii (Sand.) are similar morphologically, but R. padi has a chromosome count of 2n = 8, and R. fitchii of 2n = 10. Observations were made on these species on wheat, oats, and barley in the field and laboratory, using chromosome counts to verify species identity. Although they inhabit overlapping niches on the same host plants, there are small differences in behavior. Both species were found on barley in the field, although R. padi is much more abundant than R. fitchii. Both species were successfully reared on Poa pratensis L. and P. trivialis L. in a growth room. R. padi could be reared on shepherd’s-purse, Capsella bursa-pastoris (L.) Medic, but not R. fitchii.

Type
Articles
Information
The Canadian Entomologist , Volume 101 , Issue 1 , January 1969 , pp. 110 - 112
Copyright
Copyright © Entomological Society of Canada 1969

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