“My peonies are covered in what looks like a white powder. What is that, and will it hurt my plant?” — P.F. Peonies are susceptible to powdery mildew, and what you are describing sounds like ...

READ MORE: Three ‘simple steps’ to protect the lawn through a drought How to prevent rose rust and powdery mildew Humidity levels and temperatures create the perfect conditions for rose rust ...

There are several reasons why roses may develop spots on their leaves. Wes Harvell, Rosarian at Jackson & Perkins, explains that fungal diseases like black spot, powdery mildew or rust can cause them.

Reviews and recommendations are unbiased and products are independently selected. Postmedia may earn an affiliate commission from purchases made through links on this page. Many plants seem ...

Terry, who owns Ordnance House in Wiltshire, exclusively told Express.co.uk that the recent torrential rain could cause several problems for roses including blackspot and powdery mildew.

HORTICULTURAL beauty of the rose often depends as much on the foliage as upon the flowers. Powdery mildew caused by the fungus Spaerotheca pannosa is a very widespread trouble upon the leaves ...

And while there are many common rose problems and diseases, powdery mildew can affect roses… and just about every other plant ...

“It's famous for being one of the most disease resistant roses on earth. I was out deadheading and I found powdery mildew!” Powdery mildew is a fungus that makes leaves look like they’re ...