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Tue, Aug 4, 09 at 16:16
| I planted a centerglow ninebark two years ago and had trouble with "mildew", after cutting the water back by half the plant is doing great --- now three newly planted ladies in red are developing what looks like the same thing, powdery mildew. Why? The water and light are the same as the centerglow. |
Follow-Up Postings:
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- Posted by paula_in_pa z6 SEPA ChesCo (My Page) on Wed, Aug 5, 09 at 19:13
| Common - climatic, humidity, crowding - some help, see link |
Here is a link that might be useful: link
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- Posted by gardengal48 PNW zone 8 (My Page) on Thu, Aug 6, 09 at 8:28
| And red leaved ninebarks are rather prone to powdery mildew. Full sun, good air circulation (may need to thin interior branches), watering deeply only at root zone and practice good garden sanitation. Fresh mulch applied in fall after leaves have dropped (and been completely removed and destroyed) can help to smother overwintering fungal spores. |
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| May often be associated both with drought stress and with fog or dew in later summer. We often have both here, with susceptible kinds of plants mildewing conspicuously after the season has been in effect for awhile. Some mildew spores travel with their own moisture packet, making germination on dry leaf surfaces possible. Blowing around and trying to stick to leaves during pelting rains is probably much more hazardous than appearing during dry conditions. |
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