I know you can use plastic sleeve covers, such as the ones Dave Wilson Nursery uses around theirs.

If it's the toxins in the paint that concern you, I've found an non-toxic alternative which is a milk-based "paint."

http://www.realmilkpaint.com/

I have heard the bottom 18 inches or so is all you need to cover, with avocados being highly susceptible to trunk sun damage. These should be covered to up to branch-out, if tree is not covered by protective foliage.

I know you can use plastic sleeve covers, such as the ones Dave Wilson Nursery uses around theirs.

If it's the toxins in the paint that concern you, I've found an non-toxic alternative which is a milk-based "paint."

http://www.realmilkpaint.com/

I have heard the bottom 18 inches or so is all you need to cover, with avocados being highly susceptible to trunk sun damage. These should be covered to up to branch-out, if tree is not covered by protective foliage.

I saw a pecan orchard in Georgia with first-year trees planted out, and they protected the trunks with aluminum foil.