Abstract
The hemlock woolly adelgid (HWA) (Adelges tsugae Annand) is an invasive insect in the eastern United States. Since its initial detection in Richmond, Virginia, in 1951, HWA has spread to half of the eastern hemlock (Tsuga canadensis (L.) Carr.) natural range. Detection of early infestation symptoms via remote sensing requires the knowledge of the changes in reflectance resulting from physiological changes in the host as inflicted by the insect and the selection of equipment with the appropriate sensor characteristics. Laboratory-based reflectance measurements of infested and non-infested hemlock foliage collected from four sites in southern New Hampshire and Maine occurred biweekly over 6 months in 2012 and weekly over 5 weeks in 2013. Vegetation indices (red edge inflection point (REIP), normalized difference vegetation index (NDVI), moisture stress index (MSI), and near infrared (NIR) 3/1 ratio) were associated with concurrent chlorophyll and moisture content data. Infested first-year foliage contained ...
Department
Earth Systems Research Center; Biological Sciences
Publication Date
1-5-2016
Journal Title
Canadian Journal of Forest Research
Publisher
Canadian Science Publishing
Digital Object Identifier (DOI)
Document Type
Article
Recommended Citation
Justin P. Williams, Ryan P. Hanavan, Barrett N. Rock, Subhash C. Minocha, and Ernst Linder. 2016. Influence of hemlock woolly adelgid infestation on the physiological and reflectance characteristics of eastern hemlock. Canadian Journal of Forest Research. 46(3): 410-426. https://doi.org/10.1139/cjfr-2015-0328
Comments
This is a preprint of an article published by Canadian Science Publishing in Canadian Journal of Forest Research in 2016, the Version of Record is available online: https://dx.doi.org/10.1139/cjfr-2015-0328