Scotch Elm tree in Weekley Park Stanmore

Marrickville Council has given notice that they intend to remove a Scotch Elm (Ulmus glabra) in Weekley Park Stanmore.

They give the following reason for removal –

  • “Independent consulting arborist carried out a Picus Sonic Tomograph test report, which found that the tree is structural compromised and at risk of failure. The tree presents as an unacceptable hazard to the public.”

Council says they will replace this tree with another Scotch Elm (Ulmus glabra) during the 2012-2013 replacement tree planting program.

The deadline for any submissions is Friday 13th July 2012.

It is not unexpected to lose this tree, as severe decay is visible in one major branch of this beautiful tree, which sits with its mate guarding one of the entry paths.  It is great that Council will be replacing with another Scotch Elm tree, as this will maintain the look of Weekley Park.  With an historic park as gorgeous as this one, it would be a shame to downgrade it by planting some of the more usual trees we see like Casuarinas.

Arborism 101:  The Picus Sonic Tomograph “…. uses a set of sensors (up to 30) that are placed around the trunk at the height being tested.  The sensors are evenly spaced around the trunk & are connected by wires to record the sound transmitted through the trunk.  Each sensor has a corresponding metal pin that is inserted into the trunk & then tapped with a hammer to create sound waves that travel from the tapped pin to all the sensors.  Each pin around the trunk is tapped in turn & the test continues until all pins have been tapped with the hammer.  The number of pins used is dependent on the size & shape of the tree at the test point.

The sensors around the trunk quickly measure the velocity of the sound waves that pass through the wood.  Any variations in sound velocity are detected & can be linked to wood quality because sound velocity is different in solid wood, decayed wood or cavities.”

For more information, plus photos of trees with their corresponding Picus Sonic Tomograph images, see – http://www.enspec.com/Equipment/Sonic-Tomograph  

Looking up inside the branch with the visible decay

Written on the tree were appeals from the community to ‘save their mother tree.’

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