Pruning of forest trees to improve wood quality. Legend: (a) Natural pruned trees Deodar Tree (Cedrus deodara): (https://cdn.shopify.com/s/files/1/0579/7924/0580/files/cd_480x480.jpg?v=1699253666 accessed 29 August 2024); (b) Stem aspect after pruning the branches (Photo Brett R. McLeod 2015); (c) Section in the LR plane around the pruning zone showing the development of a branch collar (https://texastreeteam.com/wp-content/uploads/2018/05/IMG_9477-175x300.jpg accessed 29 August 2024); (d) Knots on lumber generated by a pruned branch (https://em2ys5fu2fg.exactdn.com/wp-content/uploads/2020/02/Picture1.jpg?strip=all&lossy=1&ssl=1 accessed 29 August 2024); (e) Variation of surface velocity versus the height of the tree in pruned and controlled Douglas fir grown in the Eastern part of France ([71], Fig. 3, p. 272).