Government is encouraging people to report diseased trees, to build a better picture of how they're affecting the Island's woodlands.
Diseases like ash dieback (ADB) have killed thousands of trees on the Isle of Man in the last 30 years, and are very difficult and costly to control.
To help the Department of Environment, Food and Agriculture, you can report any tree health concerns to the 'Tree Alert' app.
It's also recommended you only buy plants and trees from reputable nurseries and practice good biosecurity.
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