Table 1. Comparison of the mean values (±SE) of secondary root, primary root and the main stem weights (SRW, PRW and MSW, respectively) and main stem length (MSL), visual above-ground assessment (VA); and water potential (Ψ) in *Quercus ilex* and *Quercus suber* control seedlings (n = 45) 45 days after inoculation. |

| SRW (g) | PRW (g) | MSW (g) | MSL (cm) | VA (class) | Ψ (-MPa) |

*Quercus ilex * | 0.319 ± 0.025 | 1.547 ± 0.176 | 0.081 ± 0.062 | 10.55 ± 0.75 | 1.60 ± 0.21 | 0.76 ± 0.19 |

*Quercus suber * | 0.434 ± 0.047 | 3.984 ± 0.467 | 2.041 ± 0.197 | 23.06 ± 2.017 | 2.00 ± 0.17 | 0.22 ± 0.03 |

*p*-value | 0.04 | 0.006 | <0.001 | <0.001 | 0.001 | 0.013 |

Fig. 1. Relationship between new root weight (g) (NRW) and total seedling weight (g) (TW) in *Quercus ilex* for the different Inoculum level used. Different letters by the regression lines indicate significantly different slopes. C (control): solid diamond; D1 (dose 1): solid circle; D2 (dose 2): hollow diamond; and D3 (dose 3): hollow circle.

Fig. 2. Relationship between new root weight (g) (NRW) and total seedling weight (g) (TW) in *Quercus suber* for the different Inoculum level used. Different letters by the regression lines indicate significantly different slopes. C (Control): solid diamond; D1 (dose 1): solid circle; D2 (dose 2): hollow diamond; and D3 (dose 3): hollow circle.

Fig. 3. a) New root weight (NRW; mean ± SD) and b) new root length (NRL; mean± SD) for each of study Inoculum level (C, control; D1, dose 1; D2, dose 2 and D3, dose 3) in seedlings of *Quercus ilex* (Qi) and *Quercus suber* (Qs) (n = 45).

Fig. 4. Results of visual above-ground assessment (symptom score, mean ± SD) for each of the study Inoculum level (C, control; D1, dose 1; D2, dose 2 and D3, dose 3) in seedlings of *Quercus ilex* (Qi) and *Quercus suber* (Qs) (n = 120).

Fig. 5. Water potential (Ψ, mean ± SD) for each of the study Inoculum (C, control; D1, dose 1; D2, dose 2 and D3, dose 3) in seedlings of *Quercus ilex* (Qi) (n = 60) and *Quercus suber* (Qs) (n = 60).