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Detection and Population Estimation of the Reniform Nematode on Cotton Using Hyperspectral Remotely Sensed Data

Amber T. Kelley, Gary W. Lawrence, John Vickery, Roger King, and Hee-kyung Lee

ABSTRACT

The reniform nematode (Rotylenchulus reniformis, Linford and Oliveira 1940 ) is one of the most prevalent nematodes on cotton (Gossypium hirsutum L.). This nematode inhibits cotton plant development resulting in reduced plant growth and sometimes plant death; cotton crop yield loss up to 40-60% has been due to reniform nematode infestations. In 2001 and 2002, controlled field microplots were used to study the correlation between reniform nematode population thresholds and reflectance properties exhibited by infected cotton plants. Reflectance properties, measured by a hand-held hyperspectral spectroradiometer, were used to develop self-organized maps (SOMs). SOMs were used to determine relationships between cotton plant stress and nematode population thresholds. Using a Matlab based hyperspectral toolkit (MHTK) operating with SOM analysis, classification accuracies of 94.7-100% (2001) and 80-100% (2002) were found using a spectral range of 451-949 nm.





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Document last modified April 16, 2003