How can boring insects be recognized in woody plants?

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Blight — Plant disease Potato leaf infected with a fungal blight.

Boring insects in woody plants can be recognized by several key indicators found on the stems, branches, and trunks of the plant. The most direct evidence of their presence includes the appearance of holes in the wood accompanied by sawdustlike debris.1

In addition to these physical signs, other common indications of borer activity include:

Wilting: A loss of turgor in the plant's foliage.1
Dieback: The progressive death of shoots, which typically begins at the tip and moves downward.1

It is important to note that these symptoms can also be caused by fungi or bacteria that invade the plant's vascular tissue, so careful examination is required for an accurate diagnosis. Furthermore, boring insects often preferentially invade woody plants that are already in a low state of vigor.1