I realized: There were no birds.
The number of birds and the damage they caused seemed to increase each year in my small cherry orchard at the edge of Yakima, Wa. I figured as much as 20% of the crop went to the birds.
I read in a Government bulletin that where the American Kestrel is living...the other birds are NOT living. Knowing there was no guarantee it would work, I built two nesting boxes to attract this hawk. What did I have to lose. I had kind of forgotten about them until one day in the Spring when I climbed the wind machine to clear out the bird nests There was not a single nest. This was the time of year that birds were actively bulding their nests. I realized there were no birds.
in the orchard
None on the antenna on the house
None on the wind machine
None making nests in the trees
This worked for me!