azalea die back due to grey powdery spots on branches

earl_gardenerApril 10, 2009

I have several mature azalea plants (~10 years old). Branches started dying from a year ago. Grey powdery spots appear along the branches first before leaves eventually wilted and the entire branch died. I suspected it's powdery mildew disease and I've tried spraying with fungiside, though not often enough I'm afraid. Anybody knows for sure what this is?

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jean001(z8aPortland, OR)

It would help if you can post an image. Is that possible?

    Bookmark   April 11, 2009 at 11:03PM
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earl_gardener

See if you can access this picture:

http://picasaweb.google.com/lh/photo/ahoScMsqNUVSHn9GVQv5yw?feat=directlink

Thanks for replying.

Here is a link that might be useful: sick azalea picture

    Bookmark   April 18, 2009 at 8:52PM
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jean001(z8aPortland, OR)

Not absolutely certain, but it rather looks like lichen. If so, it's *not* killing your azalea.

If you have a large independent garden center, take a sample branch, secured in a clear container, to ask what's going on.

    Bookmark   April 19, 2009 at 1:41AM
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rhodyman(SE PA, USDA Z6)

I agree, it looks like lichens which are harmless.

Branches on azaleas die from drought or borer damage.

Here is a link that might be useful: How to grow rhododendrons and azaleas.

    Bookmark   April 19, 2009 at 6:05PM
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buyorsell888(Zone 8 Portland OR)

I agree, it is lichen. Harmless.

If you've been spraying for powdery mildew it is possible you've caused some damage unless you were using a fungicide labeled for azaleas and following the instructions to the letter.

    Bookmark   April 20, 2009 at 5:42PM
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