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|  » Stats |
Members: 50,169
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| | Welcome to our newest member, worrit | |  | 
31-05-2010, 05:56 PM
| | New Member | | Join Date: Sep 2006 Location: Lancashire
Posts: 4
| | | growth on baby oak tree leaves
Hi, I've been growing a baby oak for a few years now, it's now 2 feet high. I've just discovered that there are strange little balls attached to some of the leaves. I only noticed this as some of the leaves look liked they had a small red blotch on the top of the leaf, and turning the leaf over, appears a little greenish ball. Is this misletoe growth? Do I simply remove the "infected" leaves.
Please advise
thanks
Brian |
31-05-2010, 06:45 PM
| | New Member | | Join Date: Sep 2006 Location: Lancashire
Posts: 4
| | | Re: growth on baby oak tree leaves
Please see image for the growth in question.  |
31-05-2010, 11:01 PM
| | Active Member | | Join Date: Feb 2010
Posts: 71
| | | Re: growth on baby oak tree leaves
Hello obyapka,
Don't worry. It's just a gall. This is caused by a wasp which interferes with the growth hormones of the tree and causes these malformations. Inside will be a wasp larva which will eventually bore out. It's a seasonal and harmless phenomenum. The one you have looks like oak apple gall.
All the best
Bes |
04-06-2010, 05:59 PM
|  | Commander of the Wild Empire | | Join Date: Apr 2007
Posts: 1,238
| | | Re: growth on baby oak tree leaves
Yes this is a gall caused by a gall wasp. Most likely the cherry gall, Cynips quercusfolii, which grows on the underside of leaves. The Oak Apple (Biorhiza pallida) is rather larger and forms on a bud. It has a fairly spongy appearance at this time of year.
A 30 year old oak in the garden has about 10 different types of galls and even some of the saplings get around 5 over the year (mainly on the leaves). |
28-04-2011, 11:55 PM
|  | Commander of the Wild Empire | | Join Date: Jun 2007 Location: Northants
Posts: 1,674
| | | Re: growth on baby oak tree leaves
Oyster Gall Wasp - Neuroterus anthracinus
I have just come across this gall which looks similar to yours. I know very little about galls but thought it worth looking at. |
29-04-2011, 07:44 AM
| | Commander of the Wild Empire | | Join Date: Jun 2006 Location: Suffolk Coast
Posts: 2,099
| | | Re: growth on baby oak tree leaves
Quote:
Originally Posted by 2dogs2000  Oyster Gall Wasp - Neuroterus anthracinus
I have just come across this gall which looks similar to yours. I know very little about galls but thought it worth looking at. | I'm inclined to Pea gall (Cynips divisa) because of the size. The oyster galls are quite small.
It also seems quite large for this stage of the year. |
29-04-2011, 08:09 AM
|  | Officer of the Wild Empire | | Join Date: Sep 2009
Posts: 951
| | | Re: growth on baby oak tree leaves
Yeah, Pea gall to me. I thought that Cherry Galls develop on the flowers of oak.
Does anyone else marvel at the way that the wasp eggs carry DNA that can overlay the host DNA to produce Galls that are highly evolved entities in themselves.
I have always struggled to work out how these extremely complex systems could evolve. Any suggestions?
Dave | | |
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