climbing hydrangea infestation

susie2scottieJune 13, 2012

All three of my four-year-old climbing hydrangea bushes - in separate locations in the yard - have fibrous, cottony, white, sticky, fairly rectangular spots under their leaves. From the top they are the normal green.

One bush has seriously deteriorated and I expect the others will follow without help.

Does anyone recognize this disease and know how to treat it? Any advice would be greatly appreciated.

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I think it's cottony scale. (I've seen it called cottony cushion scale, cottony camellia scale, and cottony hydrangea scale--not sure if these are different things that can all affect hydrangea, or different names for the same thing.) I found some on my hydrangea last year but it was a limited infestation so I just pulled off those leaves. Hope someone else has a suggestion about how to treat it.

I'm going to go check my plants now!

    Bookmark   June 13, 2012 at 3:09PM
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javaandjazz(z6 CT)

You can always use a spray oil that smothers them. I have gotten that on holly and it worked. Do yourself a favor and get a jar sprayer for the hose, the oil is a concentrate. I used a pump garden sprayer and I got more on me than on the plants.

    Bookmark   June 13, 2012 at 4:41PM
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I did find some scale on my hydrangeas too! bummer.

And I guess my memory is not so great, because I asked a question about it on the hydrangea forum last year and got a good explanation. Here is the thread:

Here is a link that might be useful: Hydrangea Scale post

    Bookmark   June 13, 2012 at 10:12PM
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Thank you all for suggestions. After all the reading on scale I think I'll try washing today with some soap and oil. It may not work, but it'll make me feel better than watching it grow!

Interesting, I have two holly trees between two of the hydrangea plants and I've read that holly is susceptible to scale. I pray to the garden gods that they're safe.

    Bookmark   June 15, 2012 at 8:30AM
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i just removed a holly bush that was covered with the stuff. I was wondering what it was.

    Bookmark   June 18, 2012 at 1:53PM
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javaandjazz(z6 CT)

I have been getting it on hollies also. I sprayed one last year with the oil and it worked but the other 2 I had to respray this weekend. I also get scales on euonymus. I fina;;y got a hose end sprayer and it works much better than the garden pump srayer.

    Bookmark   June 18, 2012 at 4:48PM
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