They are big enough to see, pick off and crush, so you just need to try to remove as many as you can as soon as the attack starts. Larvae look like spiny yellow globs and the adults look like orange lady bugs. When you squish them, they ooze yellow.

Look at this crazy damage! I’m going to try to plant one more batch of bush beans this upcoming weekend; not sure we’ll get another batch before the frost but we really don’t have anything to lose. Most of the Mexican Bean Beetles are now in adulthood, so the larvae shouldn’t be an issue now… right?

Mexican Bean Beetles on Bush Beans