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  #1  
Old 09-16-2004, 09:31 PM
Evan528 Evan528 is offline
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What is wrong with this Pin Oak?

Here is a picture of a leaf from a oak tree on a clients property. I have seen this weird growth before on oak leaves but do not know what it is. Can anybody point me in the right direction? Is it harmful? How is it treated? Etc
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Old 09-16-2004, 09:35 PM
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D Felix D Felix is offline
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I believe that is oak galls.

No real harm done to the tree, just superficial.

I think there was a thread with something similiar over on the pesticide forum a couple of weeks ago.... You might try a search there.


Dan
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Old 09-16-2004, 10:43 PM
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Rollacosta Rollacosta is offline
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yep Dans correct ,it's a gall or a little egg nest usualy made by a tiny wasp that injects a chemical into the leaf ,the leaf reacts and produces this gall and the wasp lays her eggs in it ..galls come in all shapes and sizes and very rarely are they a problem ,guys always think of a tree as a corral reef ie a home for hundreds of differant flora and fauna
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Old 09-16-2004, 11:02 PM
Evan528 Evan528 is offline
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So Should I tell the client not to be concerned with this??? It will not harm the tree in any way?
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Old 09-16-2004, 11:19 PM
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Rollacosta Rollacosta is offline
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correct it will never cause the tree a prob ,to be honest i think they look nice ,the wasps are tiny and don't sting,oaks are a favorite for gall makeing wasps over in the USA and here in the UK..tell her not to worry
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Old 09-16-2004, 11:25 PM
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Rollacosta Rollacosta is offline
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actualy the galls in your'e pic do not look very attractive ,but fall is here and they will drop off with the leaves..if the trees are under 20 ft[newly planted] then for appearences they could be removed .but i wouldn't bother
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Old 09-17-2004, 04:14 PM
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Critical Care Critical Care is offline
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I'm not so sure about this being galls from what I see in the pic. Do these nodules scrape off easily? These objects look a bit like Oak Kermes Scale - which are typically found on pin oaks. Take a look at these websites:

http://www.insectimages.org/browse/s...=10555&start=1

http://www.oznet.ksu.edu/dp_hfrr/ext...ems/kermes.htm
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Old 09-17-2004, 05:17 PM
Coffeecraver Coffeecraver is offline
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Looks like oak galls to me
no harm as the others have stated.
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Old 09-17-2004, 08:07 PM
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Critical Care Critical Care is offline
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There are about 1400 different type of gall wasps, and about 600 which attack oaks. There are also many different sizes and shapes of the galls, but the most common on pin oak is probably "gouty oak gall" which encircle entire branches and can be a couple inches across.

Gall wasps deform plant tissue, actually by stinging it. Blisters can form on leaves in the spring, and then by this time in the year large "oak apples" can form. Again, just to be sure, check to make sure that these gall spots don't easily scrape off, because if they do then you probably have scale rather than gall. Since scale is more of a threat to the health of a plant, you'd want to rule that out.
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Old 09-17-2004, 08:25 PM
Evan528 Evan528 is offline
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These calls do not easily scrape off. They are attached as if they are an extention of the leaf.
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