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SEASONAL ABUNDANCE OF THE PEA APHID, ACYRTHOSIPHON PISUM (HOMOPTERA: APHIDIDAE), IN MANITOBA FIELD PEAS1

Published online by Cambridge University Press:  31 May 2012

G.A. Maiteki ,
R.J. Lamb  and
S.T. Ali-Khan
G.A. Maiteki
Affiliation:
Agrigculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada, R3T 2M9
R.J. Lamb*
Affiliation:
Agrigculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada, R3T 2M9
S.T. Ali-Khan
Affiliation:
Agrigculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada, R3T 2M9
*
3Author to whom correspondence should be addressed.
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Abstract

Pea aphids, Acyrthosiphon pisum (Harris), were sampled from 1980 to 1983 in field peas, Pisum sativum (L.), in Manitoba. Sweep and foliage samples were taken in commercial fields and plots. Aphids were found in late May or early June soon after the crop emerged, but populations were low throughout June. Populations increased in July, when the crop was flowering and producing pods, and peaked in the latter half of July or early August in 3 of the 4 years, when pods were maturing. Populations decreased rapidly after the peak, as the plants senesced. In 1980, a drought year, aphid densities were low and the populations peaked in the middle of August. From 1981 to 1983, densities exceeded the economic threshold in all commercial fields and all but one of the plots that were sampled.

Résumé

Des pucerons de l’espèce Acyrthosiphon pisum (Harris) ont été prélevés de 1980 à 1983 dans des cultures de pois, Pisum sativum (L.) au Manitoba. L’échantillonnage dans les cultures commerciales et en parcelles d’essais s’est fait au filet et par prélèvement de feuillage. La présence des pucerons a commencé en fin de mai ou au début de juin, peu après la levée des cultures, mais les populations sont demeurées peu élevée durant tout le mois de juin. Il y a eu un accroissement en juillet, à l’époque de la floraison et de la formation des cosses, atteignant un sommet vers la fin du mois ou au début d’août, 3 années sur 4, dans la phase de maturation des cosses. Après cela, on observe une chute rapide des populations coïncidant avec le vieillissement des plantes. En 1980, année sèche, les densités aphidiennes étaient basses, les populations atteignant un sommet vers la mi-août. De 1981 à 1983, les densités ont dépassé le seuil de tolérance économique dans toutes les cultures commerciales et dans toutes les parcelles expérimentales sauf une.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 6 , June 1986 , pp. 601 - 607
Copyright
Copyright © Entomological Society of Canada 1986

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Footnotes

1

Contribution No. 1189, Agriculture Canada Research Station, Winnipeg, Manitoba.

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