Sea Grape Blister Gall

You’re probably familiar with galls on Oaks and some other species. Galls are abnormal growths formed on plants as a result of insects’ egg-laying or feeding behaviors.  Most galls are not harmful to the plant (in fact we don’t even consider them pests), although they may be disturbing to your customers.

Sea Grape Blister Gall. UF Laura Sanagorski

This Sea Grape Blister Gall is caused by a midge (Ctenodactylomyia watsoni) , or a type of tiny fly.  Most gall midges prefer a specific species of plant, as in the case of this one, for which Sea Grape is the only host. The galls in this photo contain larval midges that have not yet hatched.  After they hatch, we will see a little hole in each gall where the larvae emerged.

If you notice Sea Grape Blister Gall on properties you manage, there is nothing you need to do.  This midge is not very prevalent in South Florida, and it causes very little damage.  If you do see these galls, it will only be on a few leaves here and there.  It’s definitely good to know what these interesting growths are!


One response to this post.

  1. […] in Florida in 2007.  Most often, galls are merely aesthetic issues, such as in the case of the harmless  Sea Grape Blister Galls.  In general, leaf galls are less damaging to trees and plants than stem gall galls.  This gall […]


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