Plastic mulches are currently permitted for use in certified organic production; though they've generally been on the regulated list. They may need to be removed annually (so they don't disintegrate into the soil over time).
Another strategy would be to have a vegetation free zone 4' around the tree's trunk. That requires a herbicide mix like Round-up and Simazine or a black plastic mulch. Not an option if you are of the organic school.
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