Resin Exudation

Resin Exudation

 

the abundant flow of resin from coniferous trees. Resin exudation is caused by wounds, burns, unfavorable growing conditions, and injuries produced by fungi (Cronartium flaccidum, Peridermium pini) or insects (bark beetles). The resin, or sap, flowing out of the resin passages drips onto the trunk and accumulates under the bark. It saturates the sapwood or covers the surface of the injured woody tissue, thereby protecting the tree against unfavorable elements. Resin exudation is very pronounced in young trees. It may be induced by tapping to obtain oleoresin.

REFERENCE

Lapirov-Skoblo, S. Ia. Lesnoe tovarovedenie, 3rd ed. Moscow, 1968.
References in periodicals archive ?
It is anticipated that higher additional value can be obtained from pitch pine, with continued studies on stain control, resin exudation, and twist restraint.
It is well known that suppression of twist and reduced resin exudation from products in use are among the benefits of high-temperature drying.
Yeo and Shim (2004) evaluated the applicability of high-temperature drying while applying a heavy top load on a large lumber stack and showed that it is a suitable method for drying of Korean pitch pine, due to the resulting restraint of twist, minimization of drying time, and the reduction of resin exudation and residual internal stress after drying.
In an attempt to control both darkening stain generation and resin exudation in pitch pine lumber, the drying schedule shown in Figure 6 was developed and applied to dry several boards.
The problem is due to resin exudation, which interferes with any larger radius steam bending.