Over the years there have been a lot of "the varmints are eating my fruit" posts here, and many of us have agreed that nonlethal deterrents don't work. I'd like to offer my solution: the humble pellet rifle. Mine is a cheap Crosman Classic 2100 that I paid about $60 for. I wouldn't trade it for one more expensive and powerful, and here's why. This rather cheap gun is deadly accurate for two reasons. First, I've mounted a Simmons 3x-9x deer rifle scope on it. The clear, bright optics and magnification allows you to really dial in what you're aiming at. Secondly, it takes multiple pumps to bring it up to power, from 1 to a maximum to 10 pumps. This allows you great flexibility. You'd think that the maximum velocity gained by 10 pumps would be the most desirable, but this is not the case. Carefully shooting at a 20-yard target while resting the rifle on a rock-solid rest, I found that five pumps delivered the best accuracy that this gun could deliver. Any more, and the groups tended to open up. Also, you've got to experiment with which style and weight of .177 caliber pellets the gun actually "likes." Once you've settled on this formula, don't change it. Also, this rifle can also shoot BB's. Never do that! Always shoot lead pellets exclusively. BB's are made of steel and will quickly ruin the rifling in the barrel!
If this thread generates much interest, I'll be happy to answer questions and provide photos, etc.