Fig. 1. The GGE biplot based on maize hybrid yield performance under pink stem borer infestation in five environments. Hybrids of the diallel were designated by the letters assigned to their inbred parents: A, B, C, D, E, F, G, H, I, and J for A509, A637, A661, CM105, EP28, EP31, EP42, F7, PB60, and Z77016, respectively. The hybrid checks were designated T.