Two years ago I planted a grapevine in my backyard and it really does well putting out beautiful green leaves, but it never fails that a few weeks into growth SOMETHING starts eating it. I never see snail trails or bugs on it, but boy it must taste good because whatever it is will eat every last bit of it. --- While I am at it, I also have the same problem with a small lemon tree. Any ideas? Maybe someone battles the same beast along the gulf?
I suggest you examine your plants as soon as the leaves start getting nibbled, check the plant very carefully every few hours, including about 2 hours after dark. Also, spray your plant with a foul tasting hotpepper and garlic mixture (blend with water, use lots of peppers and garlic, you want this stuff hottttt). If a skeleton of veins remains on your leaves, it's a leaf miner, if the entire leaf is gone...don't know.