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POPULATION GROWTH OF THE PEA APHID, ACYRTHOSIPHON PISUM (HARRIS) (HOMOPTERA: APHIDIDAE), AND PLANT RESPONSE TO APHID NUMBERS IN COMMERCIALLY GROWN FIELD PEAS IN MANITOBA

Published online by Cambridge University Press:  31 May 2012

J.J. Soroka
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
P.A. Mackay
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

Abstract

Pea aphids, Acyrthosiphon pisum (Harris), were sampled weekly or biweekly over the summers of 1985 and 1986 in a total of 15 commercial plantings of Century, Trapper, or Triumph field peas across Manitoba. Pea aphid populations rose more quickly in fields of Trapper than in Century or Triumph fields. The owners of all Trapper fields sampled initiated aerial application of insecticide for pea aphid control; at the time of spraying in 1985, plants in Trapper fields had significantly greater numbers of aphids in sweep samples than such samples from Century or Triumph fields. In 1986, Triumph plants supported greater numbers of aphids than Century or Trapper plants. Triumph plants remained green longer than plants of the other cultivais; in 1985 pea aphid numbers on this cultivar were highest on the last date sampled.

Yield components were measured in sprayed and unsprayed plots within the commercial fields. When data were averaged for each cultivar, there were no significant differences in yield per area or in 1000 seed weight between sprayed and unsprayed plots. Data indicated that existing economic thresholds are too low for Trapper peas. However, one of the fields of Trapper peas that we sampled had significantly reduced numbers of pods per plant, yield per square metre, and weight of 1000 seeds in the unsprayed plot; this field had the largest population of pea aphids of any field sampled, with aphid numbers peaking at 48.5 ± 9.2 (SE) per plant lip during pod formation and filling. Significant yield losses also occurred in unsprayed plots of a Triumph field, which had a peak aphid population of 4.8 ± 1.6 per plant stem at pod maturation.

Résumé

Les échantillons de puceron du pois, Acyrthosiphon pisum (Harris), ont été enlevés à travers le Manitoba, à toutes les semaines ou à tous les 15 jours, pendant les étés de 1985 et 1986 de 15 exploitations commerciales des pois des champs Century, Trapper ou Triumph. Les populations du puceron du pois ont augmenté plus vite dans les champs de Trapper que dans ceux de Century ou de Triumph. Les propriétaires de tous les champs échantillonnés de Trapper ont initié un arrosage aérien d’insecticide pour supprimer le puceron du pois; en 1985, au moment de l’arrosage, les plantes des champs de Trapper ont eu significativement plus de pucerons aux échantillons de balayage que celles des champs de Century ou de Triumph. En 1986, les plantes de Triumph ont eu plus de pucerons que celles de Century ou de Trapper. Les plantes de Triumph ont resté plus longtemps vertes que celles des autres variétés cultivées; en 1985, le nombre de pucerons du pois a été le plus haut à la date du dernier échantillonnage.

Les composants de rendement ont été déterminés pour les lotissements arrosés et non-arrosés des champs commerciaux. Après le calcul des moyens des données de chaque variété cultivée, aucune différence significative de rendement par superficie ni par poids n’a été démontrée entre les lotissements arrosés et non-arrosés. Les données ont indiqué que les paliers économiques existants sont trop bas en ce qui concerne les pois Trapper. Néanmoins, dans un des champs de pois Trapper qui a été échantillonné, nous avons remarqué un nombre de cosses significativement réduit par plante, par rendement par mètre carré, et par poids de 1000 graines aux champ non-arrosé à comparer a celui qui a été arrosé; ce champ a eu une des plus prodigieuses populations de pucerons du pois de tous les champs échantillonnés, avec le nombre de pucerons du pois en apogée à 48,5 ± 9,2 (ETM) (erreur-type du moyen) par pointe de la plante pendant la formation et le remplissage des cosses. Les pertes significatives ont aussi été démontrées dans les lotissements non-arrosés d’un champ de Triumph, ayant une apogée de pucerons de 4,8 ± 1,6 par tige de plante à la maturation de la cosse.

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Articles
Copyright
Copyright © Entomological Society of Canada 1990

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References

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POPULATION GROWTH OF THE PEA APHID, ACYRTHOSIPHON PISUM (HARRIS) (HOMOPTERA: APHIDIDAE), AND PLANT RESPONSE TO APHID NUMBERS IN COMMERCIALLY GROWN FIELD PEAS IN MANITOBA
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POPULATION GROWTH OF THE PEA APHID, ACYRTHOSIPHON PISUM (HARRIS) (HOMOPTERA: APHIDIDAE), AND PLANT RESPONSE TO APHID NUMBERS IN COMMERCIALLY GROWN FIELD PEAS IN MANITOBA
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POPULATION GROWTH OF THE PEA APHID, ACYRTHOSIPHON PISUM (HARRIS) (HOMOPTERA: APHIDIDAE), AND PLANT RESPONSE TO APHID NUMBERS IN COMMERCIALLY GROWN FIELD PEAS IN MANITOBA
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