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COMPARISON OF TWO SAMPLING METHODS FOR THE JEFFREY PINE NEEDLE MINER, COLEOTECHNITES SP. (LEPIDOPTERA: GELECHIIDAE) IN SOUTHERN CALIFORNIA1

Published online by Cambridge University Press:  31 May 2012

Thomas R. Unruh  and
Robert F. Luck
Thomas R. Unruh
Affiliation:
Division of Biological Control, University of California, Riverside 92521
Robert F. Luck
Affiliation:
Division of Biological Control, University of California, Riverside 92521
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Abstract

Within and between tree distributions of the Jeffrey pine needle miner, Coleotechnites sp. and its food resource (needles), were investigated on Jeffrey pine trees at three locations in the San Bernardino Mountains of southern California. These data were used to compare sample allocation by the component of variance technique and a method based on the mean crowding relationship. The numbers of samples necessary to estimate the mean at a given precision differed between the techniques in some cases. The mean crowding technique offered several advantages which are fully discussed. A sampling design for the Jeffrey pine needle miner is proposed.

Résumé

Les distributions intra- et inter-arbre d'une mineuse des aiguilles du pin Jeffrey, Coleotechnites sp., et de sa nourriture (aiguilles), ont été étudiées sur le pin Jeffrey à trois sites dans les Monts San Bernardino en Californie méridionale. Les données ont été utilisées pour comparer différents plans d'échantillonnage par la technique de la répartition de la variance ainsi qu'une méthode basée sur la relation du groupement moyen. Dans certains cas, le nombre d'échantillons nécessaires pour estimer la moyenne avec une précision donnée a varié entre les deux techniques. La technique du groupement moyen s'est montrée avantageuse sur plusieurs points commentés en détail. Un plan d'échantillonnage est proposé pour cette mineuse des aiguilles.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 7 , July 1982 , pp. 605 - 615
Copyright
Copyright © Entomological Society of Canada 1982

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