I think I read somewhere, that the amount in a teaspoon was enough to make 500 people very miserable!
Our 'new' old Kubota is to blaim. (or my stupidity...) We started clearing out the brush piles left from making the pond. Hubby would hook up the logs with a chain, pull them out, and I was the 'unhitch man'. That chain got pulled through all the PI, then dummy that I am, picked it up and drug it to the next log!