|Galls with a house fly, Musca domestica|
She warned me that there was a large number of yellow jacket wasps on the tree. The numbers were down by the time I arrived but the wasps were on their sugar high and paid no attention to me. While they are notorious for attacking people threatening them by walking over the hole of their nests in the ground or running a mower over them, these didn't seem to be bothered by my camera a few inches away.
Bugwood, "Rough bulletgall wasps produce a woody, generally rounded gall on bur oak, with a slight point. Very heavy infestations can occur that largely cover twigs, reducing growth rate of the tree. The galls also exude a honeydew-like sweet material that is attractive to bees and wasps and fosters growth of sooty molds."
|Bulletgall wasp - Whitney Cranshaw - CSU|
"Females emerge in late October and early November, after a hard frost. (A small circular hole in the gall indicates emergence.) Eggs apparently are laid in the terminal growth during the fall. winged and wingless forms are produced; males apparently are unknown.
|Three layers surround pupa case|
|Pupa, case and umbilical connection|
|Syncophila sp. parasitoid wasp - Tom Murray|
More on bulletgalls in general is at this Ohio State University site.
|H. axyridis larva|
|H. axyridis pupa|