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SEASONAL ABUNDANCE OF FOLIAGE-DWELLING INSECT PESTS IN COMMERCIAL FIELDS AND INSECTICIDE-FREE PLOTS OF POTATO IN MANITOBA

Published online by Cambridge University Press:  31 May 2012

D.G. Senanayake  and
N.J. Holliday
D.G. Senanayake
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
N.J. Holliday*
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
*
2Author to whom correspondence should be addressed.
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Abstract

Patterns of seasonal abundance of Colorado potato beetle, Leptinotarsa decemlineata (Say), potato flea beetle, Epitrix cucumeris (Harris), potato leafhopper, Empoasca fabae (Harris), and aphids on potato cv. Norland are reported for the 1983–1985 growing seasons in southern Manitoba. Each year, Colorado potato beetles and potato flea beetles underwent one generation on the crop. There were two peaks of leafhopper abundance in 1983 and 1984, but only one was evident in 1985. Aphid populations rose to a single peak in August of each year.

In experimental plots in the absence of insecticides, Colorado potato beetles completely defoliated plants in two seasons out of the three. In commercial fields, insecticide sprays applied in July and early August greatly reduced populations of Colorado potato beetles for the rest of the season, and there was no defoliation at harvest. Insecticides had less effect on potato flea beetle populations. Leafhopper and aphid populations were small at the time of spraying.

Résumé

Un compte-rendu est présenté pour les saisons de croissance 1983–1985, dans le sud du Manitoba, sur les patrons d’abondance saisonnière du doryphore de la pomme de terre, Leptinotarsa decemlineata (Say), de l’altise de la pomme de terre, Epitrix cucumeris (Harris), de la cicadelle de la pomme de terre, Empoasca fabae (Harris), et des aphides de la pomme de terre cv. Norland. Chaque année la récolte a supporté une génération de doryphores et d’altises de la pomme de terre. En 1983 et 1984, il y eu deux points d’abondance de la citadelle, mais seulement un fut évident en 1985. Les populations d’aphides s’élevèrent à un point unique en août de chaque année.

Lors de l’absence d’insecticides dans les terrains expérimentaux, le doryphore de la pomme de terre a complètement défeuillé les plantes en deux saisons sur trois. Dans les champs commerciaux, les vaporisations d’insecticide appliqué en juillet et au début d’août ont grandement réduit les populations du doryphore de la pomme de terre pour le reste de la saison, et il n’y avait aucune défeuillaison lors de la récolte. Les insecticides avaient moins d’effet sur les populations d’altise de la pomme de terre. Les populations de cicadelle de la pomme de terre et d’aphides étaient nombreuses au moment de la vaporisation.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 3 , March 1989 , pp. 253 - 265
Copyright
Copyright © Entomological Society of Canada 1989

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