Bird Scare Flash Tape is a great way to repel birds from your garden. 290'x1" of red and silver reflective mylar tape.
A slight breeze will cause a fluttering sound and reflections that will scare away birds. Attach to tree limbs, trellises, sprinkler risers, etc. Place 2' long streamers in orchards and 8-10" long streamers in vegetable rows or grapes every 10' to 20'.