An environmental group in northern Ontario is working to preserve black ash trees from the emerald ash borer, an invasive ...

Gee and his family had the healthy tree cut down this week after learning more about the tree's species and its dangers. "They are invasive," said urban conservationist Claire Lane, who works for the ...

The Ottawa and Allegan Conservation ... HWA is a non-native invasive insect that affects eastern hemlock trees, causing mortality within four to 10 years. Eastern hemlock trees look like dark ...