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Fig. 1. Histogram of mean grain yields of 164 semiexotic maize lines testcrossed to LH132 x LH51 evaluated in first stage yield trials in seven North Carolina environments in 1999 and 2000. Mean grain yields of Mo44 x (LH132 x LH51) and eight commercial hybrids indicated with arrows. An LSD of 0.7 Mg ha-1 is appropriate to compare means of one semiexotic line testcross to Mo44 x (LH 132 x LH51) at {alpha} = 0.05. An LSD of 0.6 Mg ha-1 is appropriate to compare means of one semiexotic line testcross to mean of all seven commercial hybrids at {alpha} = 0.05.