Ok gardeners, show me your mettle. I have a pear tree which I am told is 25 years old. It has these black shiny slugs on it which are skeletonising the leaves. Best (organic) way to dispose of them without picking them off is......? I read a variety of sites on this, but they all differ. Gardening Australia recommends sprinkling the leaves with flour, but doesn't specify plain or self-raising. Any thoughts other than building a bonfire around the base?