Pin Oak Decay from Nails and Roofing Tar: No Magic Fix

30–40 yr pin oak nailed for yard sale 2 yrs ago; rot from 10 ft down. Roofing tar applied 1 yr ago failed. Soggy wood, bugs. Cleaned out 3–4 inches deep.

Reality Check

Internal decay from wound entry is progressive and incurable. Tar, concrete, paint don't help—they trap moisture. Insects are secondary.

Palliative Care

• Fertilize and irrigate to boost vigor.
• Monitor canopy each spring for dieback.
• Eventually, tree becomes hazard—remove before storm failure.

Prevention: avoid wounds from mowers, trimmers, nails.