I have the exact same bug problem. They eat holes in the leaves and i think they lay eggs. I have lost 2 plants because of these black and yellow worms that burrow into the stem and eat out the center. I think they are the offspring of these bugs. Make sure to check your stems! I have no idea what they are or how to stop them. Ive had to manually remove the worms from a few other plants and its a bitch. Im also from the midwest. If anyone could help out that would be great.