Technical Abstract: The normalized difference vegetation index (NDVI) provides relative estimates of vegetation vigor, density, and health. Little information is available on the application of NDVI imagery for citriculture. The objective of this study was to evaluate airborne NDVI imagery for assessing tree conditions in citrus (Citrus L.) orchards. Images of two south Texas citrus groves having stressed and non-stressed trees were evaluated qualitatively. Stressed trees were easily distinguished from non-stressed trees in the images. The images were also helpful for developing survey plans of the citrus groves. These results indicated that NDVI images could be used as a tool to assess tree conditions in citrus groves. Findings should be of interest to citrus growers, extension agents, agricultural consultants, and private surveying companies.