(A) Mean values of the length of internal stem necrosis (mm) in Pinus radiata seedlings non-inoculated (C) or inoculated with Fusarium circinatum (FC), P. xcambivora (PC), P. parvispora (PP), F. circinatum ∗ P. xcambivora (FC × PC) and F. circinatum ∗ P. parvispora (FC × PP), 14 days post-inoculation (dpi), when more than 50% of the inoculated seedlings from each treatment showed disease symptoms. Data are presented as mean ± SE of four biological replicates per treatment. Values sharing the same letters are not statistically different according to Tukey’s honestly significant difference (HSD) test (p ≤ 0.05). (B) Stem internal necrosis from representative samples of Pinus radiata seedlings non-inoculated (C) or inoculated with Fusarium circinatum (FC), P. xcambivora (PC), P. parvispora (PP), F. circinatum ∗ P. xcambivora (FC × PC) and F. circinatum ∗ P. parvispora (FC × PP) observed using a zoom stereomicroscope when more than 50% of the inoculated seedlings of each treatment showed disease symptoms (14 dpi).