The influence of S. luteus and T. virens on seedling growth was evaluated by measuring four growth variables 3 months after the first inoculation (Tables 2, 3; Fig. 3). Fresh mass, plant height and collar diameter of seedlings of P. koraiensis did not differ significantly between the S. luteus ? T. virens treatment and the S. luteus ? 30 days T. virens treatment (P[0.05), indicating that the S. luteus ? 30 days T. virens inoculations were the most effective (see physiological variables, Table 6). Seedlings of P. koraiensis that were inoculated with S. luteus ? 30 days T. virens grew the tallest (1.58-fold higher than the control) and the largest collar diameter (1.43-fold higher) compared with the control. Similar results were observed for the biomass of the seedlings inoculated with S. luteus ? 30 d ays T. virens. Fresh and dry masses were 2.55-fold and 1.6-fold higher, respectively, than those of the control. Biomass did not differ significantly between the S. luteus ? T. virens and S. luteus ? 30 days T. virens treatments (P[0.05). When we compared the data with our published results (Yin et al. 2014), the trends in seedling growth for P. sylvestris var. mongolica and P. koraiensis were the same. In addition, the inoculation sequence with S. luteus ? 30 days T. virens enhanced growth of P. koraiensis more than on P. sylvestris var. mongolica (Tables 4, 5). Thus, we showed that the inoculation sequence and timing was effective for another tree species.