I had a stupid accident today. I hit one of my apple trees with a weed whacker. The tree is a little over a year old and is about 1" in diameter at the base. The weed whacker took a sizable chunk of bark off the tree and went down to the inner wood a little bit. The damage seems to go about half way around the tree, maybe a little more.

Anyone got any tips for how I can aid the tree? Should I wrap or seal the wound to prevent moisture from entering it, or does that not matter? Any tips would be greatly appreciated.

Thanks!