Last week the ADT came up to look at some projects and as we toured the countryside we found these caterpillars that were literally covering the ground in some places. Further discussion with the locals revealed these pests come about this time of year and will eat just about anything green. I saw a few thistle plants that had literally been eaten down to twigs by these critters. The more moisture, the more caterpillars, but fortunately they only present themselves for a short period of time. A week later I only saw one. It was really hard to tell if these pests were having any economic effect on the wheat; the ADT's recommendation was to walk the fields and smash 'em.