Beauveria bassiana is a fungal endophyte that thrives in a host plant without harming it, but it is parasitic to insects that consume the plant, as shown in this example of the resulting effects on pecan weevil larvae. A recent study in Argentina finds B. bassiana to also negatively affect Dichroplus maculipennis, a common grasshopper pest of crops in the region. (Photo credit: Louis Tedders, USDA Agricultural Research Service, Bugwood.org)