Rotor rack for agricultural machine, comprising a vertical central shaft (10) supported at its ends by a lower arm (1) and an upper arm (2) of an agricultural machine, a rotating drum (11) mounted so that it can rotate about said central axis (10), and a plurality of rods (12) attached to said rotating drum (11), said rods (12) radially projecting in different directions covering the entire circumference and at least a portion of the length of the rotating drum (11), rotating the rotor (50) by friction of the rods (12) with a branch of one or more fruit trees to be treated when moving the agricultural machine, characterized because: The rotating drum (11) comprises two or more coaxial drum sections (13) mounted so that it can rotate independently around the central axis (10), where each of the drum sections (13) has a plurality of the rods ( 12) fixed thereto projecting radially in different directions and covering the entire circumference and at least a portion of the length of the drum section (13)； The lower and upper arms (1, 2) have fixed bearing blocks (18) in which bearings (15) are installed； At the lower and upper ends of the central shaft (10) there are pressure pieces (25) that bear on said bearings (15) and the two pressure pieces (25) are connected to a tie rod (17) installed on the inside of the central axis (10)； Each of the drum sections (13) has at its ends base pieces (20) supporting respective bearing blocks (21) that accommodate free wheels (14) that allow a rotation of the drum section (13) with respect to the central axis (10) in a first direction and preventing a rotation in a second opposite direction, or bearings that allow a rotation of the drum section (13) with respect to the central axis (10) in both directions, First spacer sleeves (16) are disposed between the bearings (15) and said free wheels (14) or adjacent bearings； y A second spacer sleeves (22) are disposed between two free wheels (14) or adjacent bearings of adjacent drum secti
