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IMPACT OF FEEDING BY LEPIDOPTERA LARVAE ON THE PRODUCTION OF HIGHBUSH BLUEBERRY IN THE LOWER FRASER VALLEY, BRITISH COLUMBIA1

Published online by Cambridge University Press:  31 May 2012

David R. Gillespie
David R. Gillespie
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
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Abstract

Lepidoptera larvae on highbush blueberry fed more frequently in flower and fruit clusters than in leafrolls during April, May, and early June. Their feeding reduced the harvest from individual clusters to about half of that of undamaged clusters. Larval feeding caused losses of production in blueberry fields of from 2.5 to 7% depending on leafroller densities. Insecticide treatments in experimental plots decreased leafroller populations and increased cluster yields.

Résumé

Dans les mois d'avril, de mai et le début de juin, les larves de lépidoptères observées sur le bleuet en corymbe se nourrissaient plus fréquemment à même les grappes de fleurs et de fruits que dans les feuilles enroulées. Leurs déprédations ont réduit la production de fruits par grappe d'environ la moitié par comparaison avec les grappes non attaquées. Les pertes causées par les larves dans les bleuetières variaient de 2,5 à 7% selon la densité d'infestation des enrouleuses. Les traitements insecticides en parcelles ont abaissé les populations d'enrouleuses et accru le rendement de fruits par grappe.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 8 , August 1985 , pp. 949 - 953
Copyright
Copyright © Entomological Society of Canada 1985

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References

British Columbia Ministry of Agriculture and Food. 1983. Berry production guide, 1983. 56 pp.Google Scholar
Gillespie, D.R. 1981. Introduced and native leafrollers (Lepidoptera: Tortricidae) on berry crops in the lower Fraser Valley, B.C. Ph.D. thesis, Simon Fraser University, Burnaby, British Columbia. 179 pp.Google Scholar
Gillespie, D.R., and Beirne, B.P.. 1982. Leafrollers (Lepidoptera) on berry crops in the lower Fraser Valley, British Columbia. J. ent. Soc. Br. Col. 79: 31–37.Google Scholar
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