Improved sprayer (1) for the treatment by means of rows of fruit trees and / or pesticide bushes, comprising: - a support frame (2) suitable for coupling or belonging to a machine body of an agricultural machine (T) ； - an intake tank (3) coupled with said support frame (2) and suitable for containing a mixture of water and pesticides intended to be sprayed on the foliage of fruit trees and / or shrubs in an orchard； - a diffuser assembly (4) operatively connected through the articulation means (5) with said support frame (2) and composed of a pair of distribution pendants (6, 7) facing each other, at least one of the which is provided with spray nozzles suitable for spraying in a nebulized manner said mixture of water and pesticides on said foliage of said trees and / or bushes, said distribution pendants (6, 7) being suitable for adopting an operational position in which they are facing each other from each row of said orchard, separated from each other in such a way that they define a mobile tunnel in which the consecutive sections of each of said rows are received progressively while said agricultural machine (T) advances on the soil on which said orchard is planted； - - first movement means (8) suitable for positioning said diffuser assembly (4) in each of said rows； - second movement means (9) capable of separating said distribution pendants (6, 7) from said diffuser assembly (4) to position said distribution pendants (6, 7) in said operative position； - - ventilation means (10), communicating with said intake tank (3) and having at least one outlet (11, 12), operatively connected with suitable actuating means to produce a flow of pressurized air transporting said mixture of water and pesticides to said diffuser assembly (4)； - at least one distribution tube (13, 14) connected to a first end (13a, 14a) with said outlet (11, 12) of said ventilation means (10) and at a second end (13b, 14b) with a inlet (15, 16) defined in at least one of said distribution penda
