Environmental Entomology (1996) 25, 611-617

Mary Ellen Dix, Mark Harrell, Ned B. Klopfenstein, Kristen Barkhouse, Rudy King and Randy Lawson (1996)
Insect infestations and incidence of western gall rust among ponderosa pine sources grown in the central Great Plains
Environmental Entomology 25 (3), 611-617
Abstract: Six seed sources in two 22-yr-old ponderosa pine, Pinus ponderosa variety scopulorum Engelmann, provenance plantings in Hastings, NE, and Alliance, NE, were evaluated for abundance of Rhyacionia bushnelli, Retinia metallica, Dioryctria spp., and Peridermium harknessii. The 6 sources were selected for this study based on superior growth and previous susceptibility or nonsusceptibility to the aforementioned insects and pathogen. Infestation levels per tree and per branch, and proportion of infested tips were used to evaluate the influence of source on pest abundance. Abundance of the pests varied with planting. In both plantings, R. bushnelli abundance was lower on the 3 taller sources (720, 721, 757) than on the 3 shorter sources (764, 833, 835) similar to what was observed previously. The abundance of current and old R. metallica was low in both plantings and did not vary with source. At the Alliance planting, taller sources had more total Dioryctria spp. than shorter sources. P. harknessii galls were present on every sampled tree in the Hastings planting and occurred only on a few trees sampled at Alliance, but no source differences were detected. Abundance of R. bushnelli was positively correlated with previous-year R. metallica at Alliance and current-year R. metallica at Alliance and negatively correlated with P. harknessii abundance at Hastings. Interactions among environmental, host, and insect factors probably account for these correlations.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Ned B. Klopfenstein

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cronartium harknessii	Pine (Pinus)	U.S.A. (mid N)
	Rhyacionia bushnelli	Pine (Pinus)	U.S.A. (mid N)
	Petrova metallica	Pine (Pinus)	U.S.A. (mid N)
	Dioryctria ponderosae	Pine (Pinus)
	Dioryctria tumicolella	Pine (Pinus)