AbstractThe severity of foliar blight in T. vogelii incited by T. cucumeris and M. phaseoli was significantly greater for 48- and 72-hour periods of postinoculation humidity of 100 percent than for periods of 0, 12, and 24 hours. Inoculations of 1-, 2-, 4-, and 8-week-old seedlings demonstrated that disease severity was significantly greater in the 2-week-old seedlings inoculated with either pathogen and in the 8-week-old seedlings inoculated with M. phaseoli, than in other age groups. No consistent differences in resistance to the pathogens were detected among six entries of T. vogelii in damping-off trials and foliar inoculation tests in the greenhouse. However, differences were observed for leaf yield and leaf:stem ratios among 13 lines of T. vogelii which were tested in the field under a severe epiphytotic of foliar disease. Some of these differences were associated with disease resistance and the remainder with the inherent agronomic differences between lines.
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