Fosetyl-Al and fosetyl-Al nanoformulations efficacy on Xfp strain De Donno and Xylella fastidiosa subsp. fastidiosa (Xff) strain Temecula1 planktonic and biofilm growth. Efficacy of Fos and nanoFos (100 µg/mL, 10 µg/mL and 1 µg/mL) on Xylella fastidiosa subsp. pauca (Xfp) strain De Donno (A,C) and Xff strain Temecula1 (E,G) planktonic growth. Products dilutions are reported in the axis; the ordinate reports the -ΔCt value that represents the difference between the Ct value obtained at each time point (6,15 days) and the Ct value at time 0 (T6-T0; T15-T0). Efficacy of Fos and nanoFos (100 µg/mL, 10 µg/mL and 1 µg/mL) on Xfp strain De Donno (B,D) and Xff strain Temecula1 (F,H) biofilm production. The axis reports the products dilutions; the ordinates report the spectrophotometric absorbance of crystal violet at 15 days. Data are expressed as means ± S.D. (n = 9, experiment repeated 3 times with different inoculum).