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Five long-day pigeonpea [Cajanus cajan (L.) Millsp.] genotypes were evaluated for field resistance to rust (Uredo cajani) with seven planting dates per year during 1992,1993 and 1994 at the Isabela Substation of the University of Puerto Rico, Mayagüez Campus. Rust was a frequent problem over the three-year testing period but less serious when pigeonpea was planted in February. Planting date had a significant effect on the intensity of rust and the field reaction. For all genotypes, the effectdoi:10.46429/jaupr.v82i3-4.4078 fatcat:ck5cianzbbb73pqgyxv67vxj2i