I'm not sure. I can't kind find out anywhere if roses are toxic to chams and if so, then you would think that the June Beetles would be toxic, since they're eating your mom's roses. But if you were to catch some of them and feed them fruits and veggies for a while to clean out their systems, not sure what they eat and if they will eat fruits and veggies, but if they were to eat them then that would make them safe, so long as the only toxicity they produce comes from eating roses.