White powder on Diablo - Knowledgebase Question

Lake in the Hills, IL
Question by valeriesbg
July 15, 2006
I have several physocarpus opulifolius Diabolo and they are forming a white powder on the leaves. What is the cause and how do I fix it? I thought these were disease resistent?

Thanks for you help


Image
Answer from NGA
July 15, 2006

0

I can find no reference to Diablo being prone to diseases of any kind, so powdery mildew is quite a rarity. When plants are labeled disease resistant, they are resistant, but not totally immune. So if the weather has been wet and humid, if your diablo is not getting good air circulation, if it is growing in a shady or partially shady area, and if it is otherwise under stress, it can develop powdery mildew. You can spray with a fungicide and/or you can prune away the infected plant parts. Pruning should open the plant up to better air circulation. Best wishes with your diablo!

You must be signed in before you can post questions or answers. Click here to join!

« Return to the Garden Knowledgebase Homepage

Member Login:

Username:

Password:

[ Join now ]

Today's site banner is by sunnyvalley and is called "Hibiscus 'Purpureus Variegatus'"