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RHYACIONIA BUSHNELLI (LEPIDOPTERA: TORTRICIDAE) DAMAGED TIPS WITHIN PONDEROSA PINE: DISTRIBUTION AND SAMPLING UNIVERSE

Published online by Cambridge University Press:  31 May 2012

Mary Ellen Dix  and
Daniel T. Jennings
Mary Ellen Dix
Affiliation:
USDA Forest Service
Daniel T. Jennings
Affiliation:
USDA Forest Service
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Abstract

Within individual trees in an 8-year-old provenance planting of ponderosa pine (Pinus ponderosa var. scopulorum Engelm.) in central Nebraska, the infestation of tips by the western pine tip moth (Rhyacionia bushnelli Busck) generally decreased with increasing tree height and varied with whorl and seed source. Trees from Eastern Plains sources were taller and had fewer infestations than trees from three other geographic regions. Sampling tips on whorls 3 through 6, 4 through 6, or 4 through 7 all give an accurate estimate of damaged tips per tree in trees less than or equal to 3.0 m high.

Résumé

Dans une plantation de pin ponderosa (Pinus ponderosa var. scopulorum Engelm.) de 8 ans au Nebraska central, l'incidence d'attaque des tiges par Rhyacionia bushnelli Busck a montré, pour les arbres pris individuellement, une diminution en fonction de la hauteur, et a varié selon le verticille et la provenance des semis. Les arbres provenant des plaines de l'est étaient plus grands et moins attaqués que ceux provenant de 3 autres régions. Des échantillonnages à partir des verticilles 3 à 6, 4 à 6 ou encore 4 à 7, ont tous permis d'obtenir un estimé précis de l'incidence d'attaque des tiges pour les arbres hauts de 3.0 m ou moins.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 5 , May 1982 , pp. 403 - 409
Copyright
Copyright © Entomological Society of Canada 1982

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References

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