I have a sawfly problem, and have read that wasps are their natural predators. For the past 2 years the sawflies have wiped out my creeping jenny (lysmachia nummularia). I have had creeping jenny for years with no problems. Then my tenant, who is freaked out by wasps and bees, put out a wasp trap, without my knowledge. I discovered it too late. I am guessing that my wasp population was wiped out. Anyone know how to get it back, and what type of species of wasp I should be shooting for? Thanks!