Utilization of a Multispectral Radiometer to Evaluate Fungicide Efficacy to Control Late Leaf Spot in Peanut

(...) Reflectance-based measurements were faster and easier to obtain than visually based assessment methods. Percent reflectance values explained more of the variation in visual leaf spot assessments using a 1-10 rating scale compared to visual estimates of percent disease severity. Rank correlations for the ranking of fungicide treatments (based on the different assessment methods) with the rankings for pod yield revealed that reflectance-based assessments had a higher rank correlation with pod yield rankings than did visual assessment methods. Measurements of reflected radiation at 800 nm from peanut canopies can provide rapid, objective, and precise measurements to evaluate fungicide efficacy to control late leaf spot in peanuts