Insect-eating birds are one of the best pest controls around the garden, however, you have to keep them away from your fruit and berries by covering your fruit bushes and trees before the berries are noticed by the birds and usually before they are even ripe. A Chinese deterrent is to hang sliced onions in the tress to deter fruit-loving birds.
Birds such as purple martins are very beneficial to have around and encouraging them to stay close to your garden is a big advantage since they have to catch and eat flying insects constantly in order to live. Many people build martin houses to keep them around. Bluebirds also eat many insects and are not known for going after fruit.
Putting bird houses of all different sizes around your yard and garden will encourage birds to nest close by and return every year to catch many insects to feed their young with. Certain birds, such as robins and towhees love fruit more than insects, and will forego eating insects if fruit is easier to get to, so the key is not to make it easy for them by using bird netting, mesh or other materials that you can use to cover your fruit crops but still allow the sun to get to the plants. We find coverings are much more effective than anything you can hang in a tree to scare or throw off the smell, because eventually the birds will figure out how to get around anything that just hangs in a tree to deter them. Birds are clever.
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