lilac disease process

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AmandaEsq Greensboro, NC(Zone 7b) Jun 23, 2013

Neighbor asked me to look at his lilacs, but I'm at a loss.

Bumpy hard yellow growths on top side of leaves, mostly new growth tips. Leaf curl, it is spreading slowly.

Please help?

Thanks.

A.

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Diana_K Contra Costa County, CA(Zone 9b) Jun 23, 2013

I think those are galls. Never seen them so bad.
Most of the time an insect (often a wasp) lays an egg just under the leaf surface. As the larvae grows it exudes a plant growth hormone that tells the leaf to make extra tissue like that.
There is not much to do, except remove the leaves so the larvae does not become an adult that will lay more eggs.

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themoonhowl Prairieville, LA(Zone 9a) Jun 24, 2013

Here is a link that may be of use to you. I would also suggest posting on the insect ID forum...pewrhaps someone there can id whether an insect or a fungus.

http://www.cals.ncsu.edu/plantpath/extension/clinic/

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