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, the caption for Figure 6 is incorrect. The correct caption should read as follows. Overall means of r 1 r US , R 1 r US , r 1 R US , and R 1 R US groups of genotypes for three field susceptibility descriptors (MAX1, MAX2, and MAX3) in a 284 full-sib Populus deltoides × P. trichocarpa F 1 progeny. n.s. = P value associated with the Wilcoxon ranksum test of the significance of the difference between means of >5%, Characterization of Two Major Genetic Factors Controlling Quantitative Resistance to Melampsora larici-populina Leaf Rust in Hybrid Poplars: Strain Specificity, Field Expression, vol.94, pp.1358-1367