Using digital image analysis and spectral reflectance data to quantify damage by greenbug (Hemitera: Aphididae) in winter wheat

摘要: The usefulness of digital image analysis and spectral reflectance data to quantify damage by greenbugs (Schizaphis graminum (Rondani)) was evaluated for two winter wheat (Triticum aestivum L.) fields, three field experiments, one greenhouse experiment in Oklahoma Texas. A hyperspectral spectrometer a camera were used record acquire images over 0.25-, 0.37-, 1-m^2 greenbug-damaged canopies. large number vegetation indices compiled from the literature calculated relationship investigated. mean percent estimated through varied 13+/-1/0.25 73+/-7/0.37m^2. greenbug abundance ranged 191+/-22/0.25 54,209+/-7908/0.37m^2. Correlation analyses showed strong associations between indices. coefficient 0.82 -0.98. These results suggest that remote sensing using can be nondestructive, rapid, cost-effective, reproducible techniques determine with repeatable accuracy precision. Together existing indices, versions new index algorithm are suggested this paper.