Two new pests in the Willamette Valley could decimate trees and worsen the ‘urban heat island’ effect that makes some neighborhoods hotter than others For years, Portland area politicians have ...

The emerald ash borer (EAB) is a deceptively beautiful insect. As the first part of the name implies, the one-centimetre long beetles are an iridescent, metallic green. They have large, dark eyes and ...

It kills ash trees when larval beetles burrow into the tree and feed on the growing cambium level of the tree. That action cuts off nutrients to the rest of the tree. The top of the tree usually shows ...

As Oregon gets hotter and drier due to climate change, tree-killing invasive pests that prefer warmer temperatures are thriving — endangering Sitka spruce along the coast, firs in the mountains and ...

What would you say is the greatest threat to the survival of our trees? Deforestation? Climate change? How about disease? Many of us don't really think about trees getting sick or infected but pests ...

Take a stroll through your community and you'll likely pass beneath the canopy of an ash tree or marvel at these trees that bring color to your autumn garden. Ash trees, commonly planted on city ...

Minnesota's Department of Agriculture is releasing wasps in areas with known emerald ash borer infestations, hoping to slow the spread of the deadly pest. Minnesota has about a billion ash trees and ...

Add Yahoo as a preferred source to see more of our stories on Google. Trunk and branches of ash tree covered in green leaves - Damian Pawlos/Getty Images When you've visited a park or campground you ...

A fast-track method of breeding disease-resistant ash trees has been developed by researchers leading efforts to conserve the ...

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