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PHENOLOGY OF THE SAN JOSE SCALE (HOMOPTERA: DIASPIDIDAE)1

Published online by Cambridge University Press:  31 May 2012

C. D. Jorgensen ,
R. E. Rice ,
S. C. Hoyt  and
P. H. Westigard
C. D. Jorgensen
Affiliation:
Department of Entomology, Michigan State University, East Lansing 48824
R. E. Rice
Affiliation:
University of California, San Joaquin Valley Research Center, Parlier 93648
S. C. Hoyt
Affiliation:
Washington State University, Tree Fruit Research Center, Wenatchee 98801
P. H. Westigard
Affiliation:
Oregon State University, Southern Oregon Experiment Station, Medford 95701
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Abstract

Phenological events associated with control of San Jose scale (Quadraspidiotus perniciosus (Comstock)) in deciduous tree fruit orchards of the western United States were modeled, using the Predictive Extension Timing Estimator (PETE). The model closely simulated adult male activity and first crawler emergence, although spring male emergence was too variable to rely entirely on accumulated degree days from 1 January for management decisions. Pheromone monitoring of spring males improves timing for control of subsequent crawlers when a biofix of 275°D from 1 January is used.

Résumé

Les événements phénologiques associés au contrôle du poux de San José (Quadraspidiotus perniciosus (Comstock)) dans les vergers d’arbres fruitiers décidus ont été simulés à l’aide du modèle PETE ("Predictive Extension Timing Estimator"). Le modèle a simulé de très près l’activité des mâles adultes et l’émergence des premières larves mobiles, ("crawlers"), quoique l’émergence printannière des mâles était trop variable pour permettre de baser les prises de décision relatives aux interventions uniquement sur les degrés-jours accumulés depuis le 1° janvier. La surveillance printannière des mâles à l’aide de phéromone permet de préciser le moment opportun d’intervention subséquente contre les larves mobiles lorsque la constante thermique de 275°J est utilisée.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 2 , February 1981 , pp. 149 - 159
Copyright
Copyright © Entomological Society of Canada 1981

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