1. USE OF HYPERSPECTRAL IMAGERY AND SOIL ELECTRICAL CONDUCTIVITY FOR SITE SPECIFIC RENIFORM NEMATODE (R. RENIFORMIS) EVALUATIONS AND MANAGEMENT.
- Author
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Lawrence, G. W., Lawrence, K. S., van Santen, E., Burmester, C., Winstead, A., Norwood, S., King, R., and Overstreet, C.
- Abstract
The reniform nematode is an economically serious pest to cotton production in the southeast United States and is spreading across the southeast cotton belt. This nematode has become the most economically serious cotton pest in Alabama, Louisiana, and Mississippi. To implement a successful reniform nematode management program, the producers must first identify that the nematode is present in a field and determine population densities present in each location before implementing nematicide applications. Studies in Louisiana have demonstrated that nematicides have been less effective relative to soil EC measurements. In Mississippi, remotely sensed hyperspectral imagery has been correlated with reniform nematode population levels to obtain an accurate estimation of the infield nematode distribution without taking a soil sample. Alabama is currently working with the Greenseeker for on-thego collection of NDVI readings regardless of cloud cover. In 2008, a cotton production fields naturally infested with the reniform nematode was selected in Alabama Hyperspectral reflecrance data, shallow and deep EC soil electrical conductivity zones and NDVI vegetative index maps were prepared. High yielding areas in the field were distinguished from the low yielding regions by cotton root mass (r = -0.80), R. reniformis per gram of root (r = 0.93), and NDVI at 45 DAP (r = -0.93). Regression analysis indicated a significant (P = 0.06) relationship of R. reniformis counts with NDVI at 45 DAP, with an equation of R. reniformis counts (Y) = 91.998 + 1.763 NDVI (X), although the coefficient of determination was very small. [ABSTRACT FROM AUTHOR]
- Published
- 2009