3. Burned leaf (bu). Tissue in leaf tips begins to die and turn brown when plants are 10-18 inches high under field conditions. Condition spreads to one-half or more of leaf. Somewhat resembles conditions caused by certain plant food deficiencies. Classification fair, though a few heterozygous plants show some evidence of burning along leaf margins. Segregates 75% normal (Bu) to 25% burned (bu). All bu plants smaller than normal.
G. K. Middleton