Tpo causing issues

[oakum]

Chris@eden, could you expain your pollarding comment please?

[Chris at eden]

Chris@eden, could you expain your pollarding comment please?

 

No worries. Pollarding should ideally be initiated when the stem diameter is no more than 50mm, but in any case no more than 200mm. (BS3998:2010). Anything outside of this will most likely lead to physiological dysfunction and decay and should only be considered to alleviate the risk of catastrophic collapse.

 

I may be wrong be that looks like a maiden tree to me with a stem diameter closer to 400mm so technically however you reduce it, it wouldn't be a pollard. Light reduction works would be a crown reduction, heavy reduction works would be topping.

 

The result of pollarding from an early age is that a bolling (knuckle) is formed from which the re-grown shoots are pruned on a cyclical basis. If done regularly this limits the exposure of cross sectional branch material (i.e. small cuts) and the cuts occlude quickly. The resultant wound wood the covers the cuts is also made up primarily of parenchyma cells which are highly resistant to decay due to the presence of phenolic compounds. The result of small wounds and wood with a higher than average level of resistance to decay significantly reduces the risk of fungal colonisation.

 

Conversely, topping of a mature tree leaves large wounds which in reality may never occlude. Although the wound wood will form around the edges the cross sectional branch material remains exposed for many years and so open to colonisation.

 

There is a detailed description of pollarding within BS3998:2010 if you wish to read more.

 

Hope this helps,

 

Cheers,

[Adam M]

Crownlift and cut back from building.

[daltontrees]

No worries. Pollarding should ideally be initiated when the stem diameter is no more than 50mm, but in any case no more than 200mm. (BS3998:2010). Anything outside of this will most likely lead to physiological dysfunction and decay and should only be considered to alleviate the risk of catastrophic collapse.

 

I may be wrong be that looks like a maiden tree to me with a stem diameter closer to 400mm so technically however you reduce it, it wouldn't be a pollard. Light reduction works would be a crown reduction, heavy reduction works would be topping.

 

The result of pollarding from an early age is that a bolling (knuckle) is formed from which the re-grown shoots are pruned on a cyclical basis. If done regularly this limits the exposure of cross sectional branch material (i.e. small cuts) and the cuts occlude quickly. The resultant wound wood the covers the cuts is also made up primarily of parenchyma cells which are highly resistant to decay due to the presence of phenolic compounds. The result of small wounds and wood with a higher than average level of resistance to decay significantly reduces the risk of fungal colonisation.

 

Conversely, topping of a mature tree leaves large wounds which in reality may never occlude. Although the wound wood will form around the edges the cross sectional branch material remains exposed for many years and so open to colonisation.

 

There is a detailed description of pollarding within BS3998:2010 if you wish to read more.

 

Hope this helps,

 

Cheers,

 

Good explanation!

[oakum]

Good explanation!

 

Agreed and thanks for the link.

[AA Teccie (Paul)]

Agreed and thanks for the link.

 

Likewise...and that's were ARBTALK can offer good CPD opportunities.

 

Thanks Chris...et al.

Paul