https://dx.doi.org/10.1139/cjfr-2015-0328">
 

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)

https://dx.doi.org/10.1139/cjfr-2015-0328

Document Type

Article

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

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