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PEST STATUS OF FILBERT (HAZELNUT) INSECTS: A 10-YEAR STUDY1

Published online by Cambridge University Press:  31 May 2012

M. T. AliNiazee
M. T. AliNiazee
Affiliation:
Department of Entomology, Oregon State University, Corvallis 97331
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Abstract

Two blocks (one .36, other .48 ha) of filbert (hazelnut), Corylus avellana L., trees were left unsprayed for 10 years and the pest status of different species determined by periodic field examination and damage counts. The omission of all pesticides resulted in excessive build-up of the filbertworm, Melissopus latiferreanus (Wals.) (Lepidoptera: Olethreutidae) populations resulting in an average of over 20% nut damage. Filbert leafroller, Archips rosanus (L.) (Lepidoptera: Tortricidae), and filbert aphid, Myzocallis coryli (Goeze) (Hemiptera: Aphididae), populations declined and no apparent economic damage was caused by these two pests. No damage was observed from other recorded arthropod pests.

An economic analysis of standard filbert pest control programs in the Willamette Valley of Oregon indicated that during the study years, the total insecticide spray expenditures in commercial orchards ranged from 6.5% to 18.3% of the yearly returns in U.S. dollars/ha. Damage in unsprayed study orchards during this 10-year period suggests that the sprays applied for the control of aphid and leafroller yielded no return, while the sprays applied for control of the filbertworm returned an average of $3.80 for every dollar spent.

Résumé

Deux blocs (l'un de 0.36, l'autre de 0.48 ha) de noisetier commun, Corylus avellana L., n'ont pas été arrosés pendant 10 ans et le statut de nuisibilité de différentes espèces a été déterminé périodiquement par des examens et des comptages. L'omission des traitements pesticides a amené un accroissement excessif des populations du mélissope des glands, Melissopus latiferreanus (Wals.) causant en moyenne plus de 20% de dommage aux noisettes. Les populations de la tordeuse européenne, Archips rosanus (L.), et du puceron Myzocallis coryli (Goeze) ont diminué et aucun dommage apparent n'a été causé par ces deux insectes nuisibles. Aucun dommage n'a été causé par d'autres arthropodes nuisibles observés.

Une analyse économique des programmes recommandés de lutte contre les insectes nuisibles du noisetier dans la vallée Willamette en Oregon a montré que durant les années d'étude, les dépenses imputables aux arrosages insecticides dans les vergers commerciaux ont varié de 6.5 à 18.3% des revenus annuels en dollars U.S./ha. Les dommages dans les vergers non traités étudiés durant cette période de 10 ans, indiquent que les arrosages visant le puceron et la tordeuse n'ont pas été profitables, alors que ceux visant le mélissope ont rapporté en moyenne $3.80 par dollar investi.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1155 - 1162
Copyright
Copyright © Entomological Society of Canada 1983

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References

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