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EFFECT OF THE PEA APHID, ACYRTHOSIPHON PISUM (HOMOPTERA: APHIDIDAE), ON COLD-HARDINESS OF ALFALFA

Published online by Cambridge University Press:  31 May 2012

A.M. Harper  and
S. Freyman
A.M. Harper
Affiliation:
Research Station, Agriculture Canada, Lethbridge, Alberta T1J 4B1
S. Freyman
Affiliation:
Research Station, Agriculture Canada, Lethbridge, Alberta T1J 4B1
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Extract

The pea aphid, Acyrthosiphon pisum (Harris), infests alfalfa in southern Alberta and is known to reduce yield and quality of the crop (Harper 1972). From the literature on the pea aphid, recently reviewed by Harper et al. (1978), there do not appear to be any publications on the effect of the pea aphid on cold-hardiness of alfalfa or other host crops. Harper and Lilly (1966), however, found that some aphid-infested plants that were clipped in late fall did not survive the winter. We have observed that numbers of pea aphids often reach high levels on alfalfa in Alberta late in the growing season.

Type
Note
Information
The Canadian Entomologist , Volume 111 , Issue 5 , May 1979 , pp. 635 - 636
Copyright
Copyright © Entomological Society of Canada 1979

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