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SEASONAL HISTORY, ADULT FLIGHT ACTIVITY, AND DAMAGE OF THE OBLIQUEBANDED LEAFROLLER, CHORISTONEURA ROSACEANA (LEPIDOPTERA: TORTRICIDAE), IN FILBERT ORCHARDS

Published online by Cambridge University Press:  31 May 2012

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

Seasonal history, adult flight activity, and damage of the obliquebanded leafroller, Choristoneura rosaceana (Harris), on filbert were studied during a 7-year period between 1976 and 1984. Data from periodic field counts and moth catches in sex-attractant traps indicated two generations per year. The first-generation adult capture peak was generally higher than the second, except in 1978 when about an equal number of moths were trapped from both generations. A physiological time scale, using degree-days (DD), was devised for predicting emergence of obliquebanded leafroller adults. The first adults from overwintering larvae emerged at approximately 374 DD above a threshold of 10 °C starting 1 March. A total of 1172 DD were required between the first and the last adult emergence during the first generation and about 519 DD during the second generation. The obliquebanded leafroller causes both foliar and nut damage in filbert orchards of Oregon. Foliar damage was insignificant, but nut damage, caused exclusively by the first-generation larvae during June and early July, was highly destructive. Larval feeding on nuts caused staining and premature drop of infested nuts resulting in substantial yield reduction in heavily infested orchards.

Résumé

On a étudié la saisonnalité, l’activité de vol des adultes et les dommages de la tordeuse à bandes obliques, Choristoneura rosaceana, sur le noisetier durant 7 ans, entre 1976 et 1984. Les données de recensements périodiques sur le terrain et de capture des adultes au piège à phéromone indiquent la présence de deux générations par année. Le pic de capture des adultes de la première génération était généralement plus élevé que celui de la seconde, sauf en 1978 alors qu’un nombre à peu près égal d’adultes des deux générations fût observé. On a défini une échelle de temps physiologique exprimée en degrés-jours (DJ) permettant de prédire l’émergence des adultes. Les premiers adultes émergeant des larves hivernantes sont apparus environ 374 DJ au-dessus de 10 °C, calculés à partir du 1er mars. Un total de 1172 DJ se sont accumulés entre l’émergence du premier et du dernier adulte de la première génération, comparativement à 519 DJ à la seconde génération. La tordeuse à bandes obliques a causé des dommages à la fois au feuillage et aux noisettes dans des plantations de noisetiers en Oregon. Le dommage foliaire était peu important mais le dommage aux noix, causé exclusivement par les larves de la première génération en juin et au début de juillet, était sévère. L’alimentation des larves tachait les noix et causait leur tombée prématurée, amenant des pertes substantielles de rendement dans les plantations fortement infestées.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 4 , April 1986 , pp. 351 - 359
Copyright
Copyright © Entomological Society of Canada 1986

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