Dealing with gophers and newly planted fruit trees

This past winter and spring, we planted bare-root fruit trees. Only one is suriving the attacks by gophers.
Knowing that tree roots spread out far beyond the trunk and original planting hole, what methods should I use to protect the roots from munchin' gophers?
I've thought of the following:
* Chicken wire buried in a ring around the tree.
* Pounding 1 x 18 inch (or so) thick planks of wood into the ground in a ring a couple feet out from the trunk. (Just like the chicken wire.) (The wood is free and would decompose.) (I'm a little concerned about attracting termites with buried wood, though.)
* Lining large planting holes with rocks which are abundant on my property.
I'm currently trying the castor oil-based repellant. It seems to be doing a reasonable job.
Also, my property is in the Sierra Nevada Foothills and is surrounded by (nearly) wild lands. Simply killing gophers would be a never-ending task and doesn't really sit well with me. I don't mind *having* gophers; I just mind them eating stuff *I* want to consume myself....
Suggestions? Comments? Snide remarks??
--Bryan
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* Can't see the Forest | Bryan B. *
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BB wrote:

this is the best method that you propose. I lined my beds with CW when I built them, and I have had nine years of relative lack of moles/voles in the veg garden. This year I have a huge invasion, and it seems to me that the CW is mostly gone, I don't feel it when I drive a spade into the beds. but for a tree, nine years is perfect.
An even better method is to mix about ten glass bottles, broken into minute pieces, into the planting hole (I used a cloth bag and sledgehammer to get it done). The glass is too sharp for their paws, and it will stay that way forever. You might want to also put a piece of CW around the trunk, partially buried, to avoid rabbits girdling the thing, until the trees have a thick bark. Both my former crabapple and plum have been almost girdled before the final kill by deer.
I also have kiwi, grapes, currant and raspberries planted in a former dog run, with crushed limestone which has been only partially removed and ultimately covered with one foot of wood chips. That area, too, has always been free of burrows.
I should mention that the broken glass works for burrowing animals. I once mixed broken glass in the planting hole of chestnut nuts. The squirrels, from above, patiently picked through the glass and dirt and got the nut every time (20 nuts). Likewise, in your case, they may decide to emerge and just girdle it (hence the CW at the base).
Of course, you will have deer coming in. Many of my chestnuts, the crabapple, the plum, the pawpaws, the blueberry bushes, and the three mulberries have either been killed or severely maimed by deer in winter. The plum, crabapple, one of the elderberries and one of the mlberries eventually got chomped to the ground and disappeared. The persimmon, kiwis, and currants have been unaffected. Grapes, when ripe, get ripped from the vine by deer, in the process sometimes knocking down the trellis. This year I am going to try to defend the small trees with multiple layers of tomato cages, made of rebar, and chicken wire. In the end, what they really do is keep a respectful distance from the veg garden, which has an electric fence that has put the fear of god in them even though it is on only one day out of ten. The rest, persimmon and currant excepted, they destroy.
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BB wrote: [...]

When it comes to gophers, I have no pity. Kill 'em whenever you can. And defend your trees with chicken wire, lion-poo, etc.

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buried in the ground. I don't think the chicken wire thing would help, because you'd be amazed what small holes these critters can get through.
Either that or don't grow plants that are irresistable to native wildlife, which would be my preference. Unless you like a challenge, of course.
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