Shot hole borers
Shot hole borers text
Polyphagous shot hole borers make tiny holes in the bark of trees they invade, about the size of the tip of a ballpoint pen. On some species of trees, the hole may be ringed with a sugary exudate (avocados) or a dark stain. Other symptoms can include branch dieback and the presence of sawdust-like frass.
Click here for an online assessment tool.