Multispectral and hyperspectral analyses from remote sensing, a precision tool in development, can detect differences in crop health. This information must be coupled with observations on the ground, for ground-truthing of arthropod populations and plant stress factors, to allow the information seen in the image to be associated with biological factors in the field. Greenhouse experiments, using a hand-held spectrometer, confirmed that remote sensing can be used to detect spider mite and cotton aphid damage within days of infestation using green peak reflectance values. Within field plots confirmed that aerial remote sensing methods can detect infestations of spider mite and cotton aphid, as compared to uninfested cotton, using green peak reflectance values. The usefulness of these data (Type I and Type II errors) is being assessed. Hopefully these data can be used to provide growers with a way to obtain information about arthropod infestations in cotton in a timely manner in the San Joaquin Valley.