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Deadly disease kills 100-year-old tree despite vaccination

Author
Waikato Herald,
Publish Date
Fri, 3 Jan 2025, 9:55am

Deadly disease kills 100-year-old tree despite vaccination

Author
Waikato Herald,
Publish Date
Fri, 3 Jan 2025, 9:55am

 has claimed the life of a 100-year-old elm tree in the , despite the tree being vaccinated.

The fatal and fast-spreading disease is caused by a species of fungus and almost always deadly.

It was  when the local council had to remove a tree on private property in.

To combat the spread of the disease,  in November.

During the vaccination, a solution containing a verticillium fungus is injected into the active sapwood of the tree at 10cm intervals around the circumference of the trunk. The injection initiates a defence response from the tree that allows it to fight off infection caused by the disease and reduces the chances of it dying if afflicted.

However, Waip膩 District Council community services manager Brad Ward said the vaccination came 鈥渢oo late鈥 for the vulnerable tree.

鈥淭he tree had been in decline for a couple of years and the canopy had been pruned in an effort to improve its health.鈥

Dutch elm disease has claimed the life of a 100-year-old tree in Cambridge. Photo / Google Street ViewDutch elm disease has claimed the life of a 100-year-old tree in Cambridge. Photo / Google Street View

In mid-December, symptoms began to show, and the council swiftly removed the tree on  as a precaution against further transmission.

鈥淢onitoring of [the] council鈥檚 elm trees showed the tree had sudden browning of leaves and die-back of branches,鈥 Ward said.

鈥淲e decided to remove the tree before the test results came back due to the timing of the discovery and contractor availability over the holiday period.鈥

He said the other elm trees in Victoria Square and around the town hall had been inspected and were currently in good health.

The council said with the confirmation of infection in the centre of Cambridge, it was possible there are other affected trees on private land.

The council said they were continuing to closely monitor the other elm trees in the district to watch for any further transmission of the disease.

All council-owned trees in the Waip膩 district have been vaccinated against Dutch elm disease. Photo / Waip膩 District CouncilAll council-owned trees in the Waip膩 district have been vaccinated against Dutch elm disease. Photo / Waip膩 District Council

Dutch elm disease is spread by elm bark beetles, which carry the fungus from an infected tree and bore into new trees nearby.

However, it can also be spread via the trees鈥 connected root systems, by movement of firewood, or by contaminated pruning tools.

鈥淭he public should be vigilant and seek professional advice from an arborist if they are worried about their elm trees,鈥 Ward said.

If residents suspect the disease is present on an elm tree, please report it to the Ministry for Primary Industries鈥 Exotic Pest and Disease Hotline on 0800 80 99 66.

For more information visit, .

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