I hate to be a kill joy , but spraying with beneficial nematodes is NOT PESTICIDES , they are an organic / natural application of predator nematodes , IE;if your overrun with rabbits you import bobcats or coyotes. I really don't see zapping as a solution , as the magnatude of the area , the amplitude required , the voltage needed etc would seem to be cost prohibitive and time consuming......you might want to invest a little time investigating beneficial nematodes.......it's ORGANIC , it's NATURAL......lots of luck........Richard