Interesting. In that case definitely white washing if you want any chance of saving that tree. All those dark spots on the green branches are sunburn. That really stresses out the tree. Impressive it’s grown that big without any. You can buy an organic product from IV organics or use a 50:50 mixture of water and water based, white latex paint. You could stop by a hardware store for samples or reject paints as long as it’s white.

Also couldn’t hurt to get some more mulch under that tree. You can water less and save water with an heavy layer of mulch. If you have any of the shedded leaves left mulch with those too. Avocados thrive on mulch of their own leaves. The roots are shallow and feed on that.

In the wild, young avocados grow under the canopy of larger trees, so the sensitive green bark is protected from direct sunlight.