Protective device for tree trunks of reduced diameter, designed to cover in height a predetermined portion of a tree trunk that is considered sufficient to prevent the attack of rodents or other vermin, preferably for young trees and with a softer trunk, characterized in that it is obtained from a flat sheet (1), stamped with a configuration equivalent to a circular crown sector and delimited by a first straight lateral edge (1a), a second straight lateral edge (1b) perpendicular to the first lateral edge straight, and an outer edge (1c) spirally developed between both straight lateral edges, with increasing radius when advancing from the first straight lateral edge (1a) towards the second straight lateral edge (1b), having said second straight lateral edge (1b) a wide recess (2) in a position close to the junction with the first straight lateral edge (1a), of semioval general configuration, and including the flat mine starting slots in previously established positions, of which a first slit (3) extends from the inner edge of the recess (2) in a direction generally parallel with the first straight lateral edge (1a), a second slit (4) extends obliquely from a position close to the junction between the first straight lateral edge (1a) and the outer edge (1c), and a third groove (5) occupies a more central position, directed obliquely relative to both straight lateral edges, and at a distance from the inner edge of the recess (2). (Machine-translation by Google Translate, not legally binding)1. Dispositivo protector para troncos de árboles de diámetro reducido, diseñado para cubrir en altura una porción predeterminada de un tronco de árbol que se considere suficiente para evitar el ataque de roedores u otras alimañas, con preferencia para árboles jóvenes y de tronco más blando, caracterizado porque se obtiene a partir de una lámina plana (1), troquelada con una configuración equivalente a un sector de corona circular y delimitada por un primer borde lateral recto (1a),
