Fig. 2. Biplot based on diallel data of six wheat genotypes with varying resistance to Stagonospora nodorum blotch; (A) average tester ordination view, (B) polygon view. Codes of the genotypes are: A = 18NT, B = Coker9543, C = Coker9803, D = L890682, E = TX82-11, and F = TX92D7374. Genotypes are labeled with upper-case letters when viewed as entries and with lower-case letters when viewed as testers. Exact positions of the entries and testers are at the beginning of the labels. The circle indicates the average tester.