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Notes: Attack on Black Walnut Trees by the Ambrosia Beetle Xylosandrus germanus (Coleoptera: Scolytidae)

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Differences in susceptibility of black walnut (Juglans nigra L.) trees to attack by the ambrosia beetle Xylosandrus germanus (Blandford) and the long-term effects on subsequent growth were studied in a southern Illinois plantation from 1978 to 1980. The percentage of trees attacked differed by geographic source: Kentucky trees were more susceptible and Kansas, Missouri, and Tennessee trees less susceptible. All trees attacked were less than 3.25 m in height and 4.25 cm in diameter. Trees that were attacked had slower height growth rates during the growing season before attack, and sharply reduced height and dbh growth rates during the year of attack, than trees not attacked. None of the attacked trees had died by the end of the second growing season after attack. At this time, the height growth rates of attacked trees were higher than those of unattacked trees and the dbh growth rates in both groups of trees were the same. Forest Sci. 30:864-870.
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Keywords: Juglans nigra; growth; size preference; susceptibility; tree vigor

Document Type: Miscellaneous

Affiliations: Professor, Department of Zoology, Southern Illinois University, Carbondale, IL 62901

Publication date: 1984-12-01

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

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    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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