Definitely not laying eggs in your stalks. This is
Schistocerca vaga (sometimes called S. nitens). It is a common
species in the sw. US. Sometimes it lives through the winter and is still
around as an adult in the spring. Generally it is most common as an adult
in late summer and autumn, and the nymphs are around in late spring and
summer. In some of the more southerly locations it produces a couple of
generations per season. It is part of a group often called "Bird
Grasshoppers" in the US. The Old World plague locust is in this genus
(Schistocerca americana gregaria). Our Schistocerca species (including S.
americana) don't form huge swarms that destroy everything in their path,
but used to have another unrelated species that did.
There are several other species of Schistocerca in the US, some are quite
striking creatures. I've never thought of them as pests, though they can
chew some nasty holes in leaves here and there. Most tend to favor lush
vegetation (often trees or shrubs, some like tall grass), and tend to move
around a lot. They usually don't occur in high densities.
I wanted to double check the name, since I haven't really studied these
things in a number of years, don't trust my memory. When doing the Google
thing, I was surprised to find the following web site. http://www.schistocerca.org
As for the damage on the stalk, it doesn't look like chewing damage to me,
at least not recent chewing. It looks to me like a rub or bruise that
occurred when the stalk was small and killed the surface tissue. It
appears that as the stalk grew, it split the damaged tissue as the tissue
underneath grew. I suspect that there is no pest nor disease directly
responsible, though I could see how some sort of rasping damage such as that
done by a snail might have started the damage. Just guessing here
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