High nitrogen suppresses dollar spot

Dollar spot caused by Sclerotinia homeocarpa has long been known to be more severe when plant nitrogen levels are low. Pursuing this lead, Dr. Paul Koch and graduate student Ron Townsend have started looking into practical management of dollar spot using increasing levels of applied nitrogen. Their preliminary observations suggest that urea (46-0-0) spray applied at 0.6 lbs N/1000 sq ft every 14 days significantly suppresses dollar spot compared to 0.4 lbs N/1000 sq ft applied on the same schedule.…