Pear and Cherry Slugs

So did a bit of research this afternoon and discovered the little bastards that have shown up again this year demolishing our cherry tree are Pear and Cherry Slugs.  I'd even gone to the trouble this year of keeping the root suckers down, and keeping the branches trimmed short to keep them off the ground, but it seems like it's made no difference :(:(:(  So need to investigate getting the tree fumigated :(:(