Start feeding it. Then, one day he'll get hold of an alleged "bad peanut" and keel over. Just make sure only the squirrel can get to, and eat, said imaginary bad peanut.
Squirrels are basically tree rats, if you ask me. Big Box stores sell rodent eliminator; no prescription needed, no questions asked. The end justifies the means and if anyone asks, I was never here. As a matter of fact, what is this Dave's Garden you refer to?