This blog tries to get a bit deeper into the nature of the trees around me, mainly in the Low Weald of Kent.

Sunday 25 November 2012

Cracks in horizontal branches - hazard beams?

An absolutely fascinating sight on a long near-horizontal branch on a beech tree.





Commonly found in Beech and Oak, according to Arbtalk. "This fault tends to happen to phototropic limbs (extending rapidly toward light) 90% of the time they are growing on the North side if in open ground as the limb tries to reach away from the main body of the crown to reach out from canopy shading.

it is very common, and in most cases removal of the branch is not needed, simply reduction by one third the length is usually enough to manage the hazard. This is a good way of maintaining the habitat that is the hazard beam. In time they stabilise and occlude, how many limbs have you ever cut only to see they have a large crack at their centres? Removal makes a large wound at the stem junction, a higher future risk than a stabilised hazard beam fracture.

Dog legs where a leading tip has died and a sub order shoot takes over as in this case are more prone to the fault, and worth looking out for when managing trees, especialy in parkland or open grown situations.

Also worth noting that Matthecks slenderness ratio can be applied to limb assesment as well as stem calculations."

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