Light-reflecting objects keep birds out of trees...does it work for squirrels too?

I have two large cherry trees and hazelnut trees that the squirrels and the birds love to have a hay day in! They eat all of the cherries and nuts before we get a chance to pick them and sometimes before they're even ripe. Anyway, I've been doing research, and I've found that putting light reflecting objects will keep the birds away. Will this work on the squirrels in the hazelnut tree as well? If not, what can I do to keep them away? Killing them is not an option...nor is trapping them.Light-reflecting objects keep birds out of trees...does it work for squirrels too?
Place a couple of fake owls in the trees!Light-reflecting objects keep birds out of trees...does it work for squirrels too?
Fake owls and metal pie plates should help.