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Forests 2014, 5(11), 2810-2824; doi:10.3390/f5112810

The Effects of Silvicultural Treatment on Sirex noctilio Attacks and Tree Health in Northeastern United States

U.S. Department of Agriculture Forest Service, Northeastern Area State and Private Forestry, 271 Mast Rd., Durham, NH 03824, USA
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Received: 13 October 2014 / Revised: 4 November 2014 / Accepted: 11 November 2014 / Published: 19 November 2014
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Abstract

The invasive woodwasp Sirex noctilio (Hymenoptera: Siricidae) is established in east-central North America. A replicated case study testing the effectiveness of silvicultural treatments for reducing the number of S. noctilio attacked trees in a stand was conducted in New York, USA. Silvicultural treatments reduced S. noctilio attacked trees by approximately 75% over the course of the study. There was no tree growth response to silvicultural treatments in the four years after thinning, but targeted removal of weakened trees removed potential S. noctilio habitat from treated stands. Two spectral vegetation indices were used to determine tree health in each treatment and potentially provide guidance for detection efforts. Silvicultural treatment significantly influenced the Red Edge Inflection Point, a strong indicator of chlorophyll content, and the Moisture Stress Index, a reflectance measurement sensitive to changes in foliar leaf water content, with the greatest differences occurring between control and treated blocks. Vegetation indices showed promise as a tool for aiding in stand prioritization for S. noctilio surveys or management activities. View Full-Text
Keywords: tree health; stand thinning; spectral analysis; vegetation indices tree health; stand thinning; spectral analysis; vegetation indices
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dodds, K.J.; Cooke, R.R.; Hanavan, R.P. The Effects of Silvicultural Treatment on Sirex noctilio Attacks and Tree Health in Northeastern United States. Forests 2014, 5, 2810-2824.

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