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FEEDING PREFERENCES OF THE WESTERN FLOWER THRIPS, FRANKLINIELLA OCCIDENTALIS (PERGANDE) (THYSANOPTERA: THRIPIDAE), AND INCIDENCE OF TOMATO SPOTTED WILT VIRUS AMONG CULTIVARS OF FLORIST’S CHRYSANTHEMUM

Published online by Cambridge University Press:  31 May 2012

A.B. Broadbent ,
J.A. Matteoni  and
W.R. Allen
A.B. Broadbent
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
J.A. Matteoni
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
W.R. Allen
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
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Abstract

A wide range in feeding damage as defined by leaf scars among 27 cultivars of florist’s chrysanthemum was apparent for the western flower thrips, Frankliniella occidentalis (Pergande). Assessments based on numbers of feeding scars or ranking of cultivars on the basis of the leaf area damaged by feeding were in close agreement. Cultivars with the most feeding damage under growth room conditions, such as cvs. White Marble and Polaris, were the same as those in plots within a naturally infested commercial greenhouse. Under growth room conditions, a 2- to 4-week exposure of plants to a population of thrips was sufficient to evaluate feeding damage. Closely related cultivars had similar levels of feeding damage, and foliage of yellow-flowered cultivars was significantly more attractive to thrips for feeding than foliage of white-flowered sister cultivars during the pre-bloom period. There was a low correlation between feeding damage and incidence of the tomato spotted wilt virus among cultivars in both growth room and greenhouse tests, indicating that virus susceptibility of cultivars was epidemiologically more significant than the feeding activity of western flower thrips.

Résumé

Une large étendue du dommage, définie par les cicatrices sur les feuilles, occasionnées par l’alimentation du thrips des petits fruits, Frankliniella occidentalis (Pergande), sur 27 variétés cultivées de chrysanthèmes de fleuriste, a été démontrée. Les évaluations, basées sur le nombre de cicatrices alimentaires ou sur l’étendue de la feuille des variétés cultivées endommagée par l’alimentation du thrips, ont été en proche rapport. Les variétés cultivées ayant le plus de dommage alimentaire sous les conditions de la chambre de croissance, telles que les variétés White Marble et Polaris, ont été pareilles que celles de lotissements sis dans une serre commerciale naturellement infestée. Sous les conditions de la chambre de croissance, l’exposition des plantes à une population de thrips pendant 2 à 4 semaines a été suffisante pour évaluer le dommage alimentaire. Les variétés cultivées apparentées de proche ont eu des niveaux semblables de dommage alimentaire et le feuillage des variétés cultivées à fleurs jaunes a été significativement plus attrayant au thrips comme alimentation que celui des variétés-soeurs à fleurs blanches pendant la période de pré-floraison. La corrélation entre le dommage alimentaire et la fréquence du virus du dessèchement taché de la tomate a été basse parmi les variétés cultivées et dans les chambres de croissance et dans les épreuves aux champs, indiquant ainsi que la prédisposition des variétés cultivées du chrysanthème à l’épidémie occasionnée par le virus est plus importante que l’activité d’alimentation du thrips des petits fruits.

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1111 - 1117
Copyright
Copyright © Entomological Society of Canada 1990

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Footnotes

1

Current address: Westgro Sales Inc., 7333 Progress Way, Delta, British Columbia, Canada V4G 1E7.

References

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