Scores of leaf drying were collected according to the standard IRRI evaluation system when differences were observed among entries (IRRI, 1996). The scale used ranged from 0 (no visible drying) to 5 (more than 40% of the leaf area fully dried).
Analyses of variance were conducted using SAS to generate least squares means for each entry. Phenotypic correlations were calculated from these means using SAS. Genotypic correlations were calculated (Falconer, 1981) for DHLs in 1998 in order to allow a general comparison with the phenotypic correlations.