Dave, I don’t know if termites are an issue for you in your area, but I avoid putting wood to ground if at all possible, due to the possibility of attracting termites. Plus, not sure I want pressure treated wood’s chemicals to leach down around my fruit tree roots. Not sure how much of that might seep into the soil, and then up into the tree and fruits, but for those two reasons, I personally would not use wood or pressure treated wood. Cardboard and mulch is a pretty inexpensive option. This should work for several seasons. You can also put bender board around the tree, creating a large well, then line it with cardboard and mulch. Depending on how many trees you have.
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