By Tobias Carroll Trees can form the core ecosystem for a host of other species. That isn’t always a good thing. Certain species of insect, for instance, have a parasitic relationship to the trees where they live. The shot hole borer, described in an article from the California Native Plant Society as “the perfect pest,” falls neatly into this category. The beetle drills into the trunks of trees, where it farms fungi for food. Unfortunately, that had an adverse effect on the trees themselves, and can lead to their deaths. It’s led a number of organizations to find ways to spot these tiny insec…