Alfalfa seeded during late summer or fall is susceptible to the destructive disease Sclerotinia crown and stem rot. Fall-seeded stands are particularly vulnerable to this disease because the young seedlings do not have sufficient time to develop adequate resistance before infectious spores of the pathogen are produced in late October.
Risk Factors for Sclerotinia Crown & Stem Rot in Fall-seeded Alfalfa (PPFS-AG-F-02) is available online.
For additional publications on forage diseases, visit the UK Plant Pathology Extension Publications webpage.
By Cheryl Kaiser, Plant Pathology Extension Support and Paul Vincelli, Plant Pathology Extension Specialist