Oak Gall Wasp | From the Ground Up

Oak Gall Wasp | From the Ground Up


So if you have a Bur Oak in your yard, you
might have noticed some growths like this on your tree. These galls are formed when
the Rough Bulletgall Wasp lays its eggs in the bark of the Bur Oak tree. They’re formed
in order to compartmentalize the larvae from the rest of the tree. As you look at your tree, some of the galls
have exit holes in them. That’s where the adult wasps have emerged out. They typically
emerge in October or November and then they lay eggs again in the terminal buds of the
tree. And then in the spring, those adults again emerge out and once again lay eggs in
the bark and the process begins again. One of the best controls for the Rough Bulletgall
Wasp is actually another wasp. It is a parasitic wasp that emerges in the springtime and will
actually parasitize the wasp while its still in the gall. So it’s really important if
you are going to be pulling galls off of your tree, you do not want to pull off galls in
the springtime. So it’s important again to remember that the Rough Bulletgall Wasp
is not going to kill your tree. Due to the additional resources required to produce the
galls it might slow down its growth a little bit, but beyond the aesthetic unpleasing sight,
it won’t kill the tree. This has been Caleb Carter from the University
of Wyoming Extension. You’re watching From the Ground Up.

3 thoughts on “Oak Gall Wasp | From the Ground Up”

  1. Have these galls on swamp white oak Quercus bicolor.  Seen the exit hole and was wondering what insect did this. Thank you for the info.

  2. Wow this is awesome. I used to collect these things as a kid because they were cool but i never knew what their purpose was. Nature never ceases to amaze me

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