Pine Bark Beetle and Dwarf Mistletoe Infestation in a Remnant Old-Growth Stand
Authors:
- Nicholas AflittoNANicholas Aflitto
- Tom DeGomezTDTom DeGomez
- Richard HofstetterRHRichard Hofstetter
- John AnholdJAJohn Anhold
- Joel McMillinJMJoel McMillin
- Mike WagnerMWMike Wagner
- Eryn SchneiderESEryn Schneider
- 1 October 2015
- journal article
- Published by Western North American Naturalist in Western North American Naturalist
- Vol. 75 (3) , 281-290
Abstract
We examined the incidence of bark beetle (Coleoptera: Curculionidae: Scolytinae) colonization and subsequent mortality, and the presence of dwarf mistletoe (Arceuthobium vaginatum subsp. crytopodum) within a rare remnant old-growth stand of ponderosa pine. In 2011, 96% of the old growth trees were remaining with additional dense ingrowth of ponderosa pine (Pinus ponderosa Douglas ex. Lawson) within the understory of the oldest trees. We compared the old-growth stand to abutting stands of ponderosa pine: a low-density seed-tree cut and a high-density post-1900 second growth. The old-growth stand had levels of bark beetle colonization similar to the seed-tree stand, and both of these stands had significantly more bark beetles than the high-density stand. Across all sites, bark beetles were found in higher numbers in the 51–60 cm diameter class. We found a trend between the proportion of trees infected per site and the percentage of trees with bark beetle activity, although a direct relationship be... Resumen. Examinamos la incidencia de la colonización de escarabajos de corteza (Coleoptera: Curculionidae: Scolytinae) y su mortalidad subsecuente, así como la presencia de muérdago enano (Arceuthobium vaginatum subsp. crytopodum) dentro de un remanente raro de pinos maduros (Pinus ponderosa). En el 2011, el 96% de los árboles maduros aún permanecía ahí con un crecimiento interno denso de pino ponderosa (Pinus ponderosa Douglas ex. Lawson) en el sotobosque de árboles más viejos. Comparamos la zona de árboles maduros con zonas colindantes de pino ponderosa, con una zona de baja densidad de árboles por tala selectiva, y con una zona de alta densidad de crecimiento secundario posterior a 1900. La zona de árboles maduros tuvo niveles similares de colonización de escarabajos de corteza que la zona de tala selectiva, y la colonización en estas dos zonas fue significativamente más elevada que en la zona de alta densidad. En todos los sitios, los escarabajos de corteza se encontraron en mayor número en árboles co...Keywords
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