Assessing Biological Control Damage of Giant Salvinia with Field Reflectance Measurements and Aerial Photography

Everitt, James H. and Flores, D. and Yang, C. and Davis, M. R. (2005) Assessing Biological Control Damage of Giant Salvinia with Field Reflectance Measurements and Aerial Photography. Journal of Aquatic Plant Management, 43, pp. 76-80.

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Abstract

A study was conducted on a small pond in southeast Texas to evaluate the potential for using remote sensing technology to assess feeding damage on giant salvinia ( Salvinia molesta Mitchell) by the salvinia weevil ( Cyrtobagous salviniae Calder and Sands). Field spectral measurements showed that moderately damaged and severely damaged plants had lower visible and near-infrared reflectance values than healthy plants. Healthy, moderately damaged, and severely damaged giant salvinia plants could be differentiated in an aerial color-infrared photograph of the study site. Computer analysis of the photograph showed that the three damage level classes could be quantified. (PDF has 5 pages.)

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