If you want to keep deer off of new trees, you can make a deer repellent from eggs and milk. Beat a couple of eggs together with a cup of milk, add to a gallon of water and mix thoroughly. Cover and let it sit outside somewhere warm (not in a sealed container, though - it will pressurize and explode if you do that) for a day. It will stink, but if you paint or spray it on your trees, it's pretty effective at keeping the deer away. After it dries for a day or two, the odor subsides below the human threshold, but animals can still smell it. Putrefied eggs are the main ingredient in commercial deer/rabbit repellents like Liquid Fence.
You can add cayenne pepper or garlic (or both) to enhance its effectiveness, also.
In my experience, deer require a multi-pronged approach to control. Barriers, repellents, and startle mechanisms are all part of the equation.
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