Q: Last year powdery mildew spread across most of my garden including my pumpkin and squash patch. Do the spores overwinter in soil? Will turning soil help? Anything that should avoided at all costs? ...

Lots of plants, both edible and ornamental, can get powdery mildew. Unlike many other fungal plant diseases, the fungi that cause powdery mildew thrive in hot, dry weather that's often the norm in mid ...

Because powdery mildew does not significantly affect the health of most plants, treatment is seldom necessary or practical in the home garden. Many gardeners learn to live with the appearance of ...

The gardening season has started and if you’ve got questions, turn to Ask an Expert, an online question-and-answer tool from Oregon State University’s Extension Service. OSU Extension faculty and ...

Q: Last year my grapes had such bad powdery mildew that even the grapes dried up and looked moldy and shriveled. I was told by the master gardeners at the farmer’s market that I needed to do something ...

I went away for the weekend and came home to find some my plants covered with what looks like a white powder. What should I do? — L.H. Powdery mildew becomes apparent when you notice a whitish ...

Whether you’re a novice or avid gardener, discovering your greenery is dealing with a disease is never a pleasant surprise. One frequent problem that often pops up during the warmer months: powdery ...

Powdery mildew is one of those problems that is immediately obvious, once you know what to look for. Here's the bad news: Most local gardeners know it so well because everyone deals with it this time ...

Powdery mildew appears as white or gray spots on roses, usually during warm, humid conditions. Catching infections early is key to stopping them from spreading by removing diseased parts and applying ...

Q: My peonies have powdery mildew and I'm wondering what I can do to get rid of it. What causes this? I'm planning to divide them this fall but I don't want to spread it into a different flower bed. - ...

Question: What is this white coating on the leaves of my chokecherry tree, and what would you recommend to get rid of it? Answer: The likely culprit for those symptoms at this time of year in New ...