you could try.............on a windless and sunless day................2 1/2 tablespoons
3% medical hydrogen peroxide with 1 gallon of water and spray.................
wear old clothes, hat, goggles, mask and gloves.....................use the whole amount....do not save this....................KEEP CHILDREN & PETS AWAY FROM THIS AREA UNTIL IT IS DRY. Good luck with this tree. There is a bore bug causing problems with the trees.