Soapy water can help eliminate pests. A comment: When the going gets tough, add some Listerine type mouth wash and a bit of water that chewing tobacco has been soaked in. This mix can defeat - of the pests: slugs, snails and rabbits hate the taste of it.
Oh, I love yam vines! Heart-shaped leaves and they are a lovely yellow-green. Goes really well with other greens. Other pinner said: My grandmother, Lala, used to do this. The vines were lovely and used to run up and around the windowsills.