borer holes in my plum tree

Question

What do you recommend to “plug” up holes made by borers in my plum tree? I have cleaned out the holes & sprayed the tree but want to fill the holes in so no other pests or rain will enter the tree.

Answer 1

Arborists no longer recommend plugging holes in trees, or painting wounds with sealants. You can, however, do what is called "clean cutting." This article will tell you more: https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm