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How to protect your cherry trees from birds
Start when birds begin to show.
Keep track of bird sightings in your garden or orchard, either with a formal count or by intuition. Once the number of birds starts to grow, and the fruit shows the first hint of color, it's time to protect the trees.
These scare tactics are very effective, but only last a few weeks. Starting too early may leave your trees vulnerable later, once the birds are used to your tactics.