Tree Trunk Goop
Mix equal amounts of diatomaceous earth, soft rock phosphate and compost together. Add enough water to make a thick slurry. Slather this wet mix onto the damaged area. Reapply if washed off by rain or irrigation. In the soil, the mix makes a good organic fertilizer. Fireplace ashes can be used if soft rock phosphate isn’t available.
Tree Trunk Goop after neighbor's dog did damage trying to get a squirrel.