Ekka
Addicted to ArboristSite
Dave, where you have marked up your picture with "A" I think was existing at time of injury.
The other two arrows further up has grown after wounding, we have established clearly that where there is no wound wood (differentiated callus wood) there is no wall4, that was very conclusive even by the biggest proponents of wall4 present at time of wounding proponents.
The wound progressed (as expected) to the centre of the tree (pith) and decayed from inside out where once again we tested that wall4 wont initiate when the decay comes from inside migrating outside as the cells which differentiate to callus are not being affected and not triggering a wall4 response. This is why often we have hollow tube (cylinders) for trees and as the next growth ring comes the last one left behind succumbs to decay. The decay resistant properties are strongest in the sapwood, also as the tree grows and the heartwood is decaying at the same rate as the growth rate (almost ring for ring) the tree is unable to store away anything into that heartwood which likely means the tree is now carrying more phenolic compounds in it's sapwood making it resist decay stronger than before.
The reason why barrier zones tend to favour growth rings should be clear to most people who have half a clue about tree biology.
When I need my lawn mowed I call Jims, when I need my trees done I call a qualified arborist who researched and studied.
Consumers choose your tree man carefully, we are far from being all the same.
The other two arrows further up has grown after wounding, we have established clearly that where there is no wound wood (differentiated callus wood) there is no wall4, that was very conclusive even by the biggest proponents of wall4 present at time of wounding proponents.
The wound progressed (as expected) to the centre of the tree (pith) and decayed from inside out where once again we tested that wall4 wont initiate when the decay comes from inside migrating outside as the cells which differentiate to callus are not being affected and not triggering a wall4 response. This is why often we have hollow tube (cylinders) for trees and as the next growth ring comes the last one left behind succumbs to decay. The decay resistant properties are strongest in the sapwood, also as the tree grows and the heartwood is decaying at the same rate as the growth rate (almost ring for ring) the tree is unable to store away anything into that heartwood which likely means the tree is now carrying more phenolic compounds in it's sapwood making it resist decay stronger than before.
The reason why barrier zones tend to favour growth rings should be clear to most people who have half a clue about tree biology.
When I need my lawn mowed I call Jims, when I need my trees done I call a qualified arborist who researched and studied.
Consumers choose your tree man carefully, we are far from being all the same.