Liu, L.-J. and Ramírez-Oliveras, G. 1980. OCCURRENCE OF SORGHUM AND JOHNSONGRASS DOWNY MILDEW IN PUERTO RICO. The Journal of Agriculture of the University of Puerto Rico. 64, 4 (Oct. 1980), 489–492. DOI:https://doi.org/10.46429/jaupr.v64i4.10195.