My mother insisted that we put WD-40 on her yard every spring to kill the cut worms, etc. She alos insisted that she put 2-4-D on her arthritis.......we didn't argue with her, we just put the 2-4-D on the yard, and kept getting her WD 40 for the house......she was probably the only person in the world who was convinced that WD 40 killed cut worms. Whether or not it does, I have no idea.