When lentils are planted adjacent to a field where lentils were grown the previous year, a pronounced gradient of Ascochyta blight is often observed. In this study, neither the use of a 90-foot-wide or 270-foot-wide fungicide treated strip provided satisfactory disease control in the lentils grown immediately adjacent to the previous year’s lentil crop. We conclude that the use of a fungicide-treated strip is a risky strategy, and that a foliar fungicide application to the entire field may be advisable in lentils planted adjacent to a field where they were seeded the previous year, especially when weather conditions favor the disease.