Summary and Implications
Four years of research with foliar fungicides in alfalfa production indicate that the best chance for profitability is with an application in spring to first crop growth at a six to eight inch canopy height. Fungicide applications to later crops during the season are of questionable economic value, and highly dependent on crop yield potential and environments more conducive for disease development.
Iowa State University
Lang, Brian J. and Pecinovsky, Kenneth T.
"Foliar Fungicides in Alfalfa Production:
A Four Year Summary,"
Animal Industry Report:
AS 661, ASL R2964.
Available at: https://lib.dr.iastate.edu/ans_air/vol661/iss1/27