Patrick Wagner SDSU Extension Entomology Field SpecialistAdditional Authors: Amanda Bachmann,Philip Rozeboom,Adam Varenhorst Blister beetles are becoming more common as we progress through the growing season. Recently, there have been multiple reports of blister beetles showing up in alfalfa fields. The larvae of these beetles are beneficial because they feed on grasshopper eggs. However, the adults feed on the leaves and blossoms of plants, including alfalfa, and contain a toxic chemical called cantharidin. They can…