These growths are formed by the tree in reaction to insects usually laying eggs. These are call insect galls. There are many types of insect galls. The tree grows the gall around the egg. The larva hatches out and eats its way out of the gall. On a young gall, you can cut it open and see the larva circled up in the gall. If there is a hole in the gall the larva has already pupated and emerged as an adult.

These galls do not usually harm the tree nor will the insects harm any of your plants. The insects that cause the tree to grow galls are usually tiny wasp. These wasp pick aphids and other insects off the tree to carry back to their nest.

You might not see them for several years after this infestation

 To learn more go to: https://insects.tamu.edu/extension/publications/epubs/e-397.cfm

Also some damage may be due to twig girdlers

http://texasforestservice.tamu.edu/main/popup.aspx?id=1208

we usually see twig girdlers are usually seen in the fall but who knows with all this rain what will show up.

Your county Extension agent will have information if this is a big problem in your county. Call your county Extension office

McClennan County Extension office

420 N. 6th Street
Waco, Texas 76701
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