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POPULATIONS OF BENEFICIAL AND PEST ARTHROPODS IN AN ORGANIC AND A PESTICIDE TREATED APPLE ORCHARD IN BRITISH COLUMBIA1

Published online by Cambridge University Press:  31 May 2012

H. F. Madsen  and
B. J. Madsen
H. F. Madsen
Affiliation:
Agriculture Canada, Research Station, Summerland, British Columbia V0H 1Z0
B. J. Madsen
Affiliation:
Agriculture Canada, Research Station, Summerland, British Columbia V0H 1Z0
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Abstract

A 2-year study was conducted in an organic, essentially pesticide-free orchard and in one which followed a complete pesticide program to assess populations of beneficial arthropods. There were far more beneficial species in the pesticide-free orchard both on the trees and in the cover crop. Spiders increased dramatically in the organic orchard and relatively few spiders were found in the sprayed orchard. Pest species were below treatment thresholds in both orchards with the exception of codling moths. By the second season, codling moth injury was so severe in the organic program that the non-pesticide program had to be abandoned.

Résumé

Une étude de deux ans a été conduite dans un verger exploité en régime de culture biologique, essentiellement exempt de pesticides, et un autre en régime intégral de traitement aux pesticides, afin d'évaluer les populations d'arthropodes utiles. Le verger "sans" pesticides contenait beaucoup plus d'espèces utiles sur les arbres et dans la culture de couverture. Une hausse spectaculaire du nombre d'araignées était observée dans ce dernier, par rapport au verger traité aux pesticides. Le nombre de ravageurs était inférieur au seuil de traitement dans les deux vergers, sauf pour le carpocapse de la pomme dont les dommages au début de la deuxième année étaient si graves que le programme de culture biologique (sans pesticides) a dû être abandonné.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 11 , November 1982 , pp. 1083 - 1088
Copyright
Copyright © Entomological Society of Canada 1982

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