TARNISHED PLANT BUG RESPONSE TO CROP VIGOR AND DETECTION OF VIGOR DIFFERENCES VIA REMOTE SENSING

摘要

Three years of tarnished plant bug (TPB), Lygus lineolaris (Palisot de Beauvois), infestation data and vegetation index data (calculated from remotely sensed imagery data) from two research fields on Delta Branch Experiment Station, Stoneville, Mississippi were subjected to linear regression analysis. Coefficients of determination (r~2) showed a strong functional relationship of cotton vigor (measured as plant height and canopy width) and the normalized difference vegetation index (NDVI) and five other vegetation indices. Lower r~2 values indicated a weaker functional relationship of TPB infestation and vegetation indices. Analysis of frequency distributions of above treatment threshold TPB infestations relative to partitioned vegetation indices (equal interval quartile classes) gave a better indication of the relationship between TPB infestation and crop vigor.