Learn how to identify, prevent, and treat powdery mildew with this guide. Discover organic and chemical treatment options, as well as management strategies for long-term control.

The grayish white powdery growth you are seeing on the dahlia leaves is caused by a fungus and can also be a common garden problem on other plants. Many species of fungi can cause powdery mildew on ...

You might be noticing powdery mildew (a disease that causes a grayish, powdery film on leaves) in your garden. Common plants that could be affected are lilacs, phlox, bee balm, zinnias and nannyberry ...

“The leaves of my peonies are covered with what appears to be a white mold, with some of the leaves even turning brown already. What is this problem, and will it affect the plants next year? Should I ...

Hydrangeas are a favorite flowering shrub among gardeners. With their dark green leaves and big, showy blossoms in shades ranging from blue to deep pink, they can easily steal the spotlight in any ...

If you are like me, you have some peonies in your landscape. Peonies are great because the produce these giant flowers pretty early in the season. But after that, they are a nice, green, leafy plant ...

Here we are, on the last Saturday of a hot and muggy July, and the word miasma comes to mind as I look to a bed of peonies. Foliage of several plants is disfigured and a grayish-white powder is easy ...

CORVALLIS, Ore. – Charmingly mild weather this winter will most likely coax roses into bloom early, which means dealing with the usual diseases and pests earlier, too. When it comes to one of the ...

A key to surviving in the wild is fighting off infection -- and not just once. For plants, as with humans, one infection may or may not leave a plant with lasting immunity. Biologists conducted a ...

David Markel, research and development manager at Willamette Valley Vineyards, prepares to operate Thorvald at the winery south of Salem. The robot shines an eerie green in the dark of night as it ...