GLOBS OF SAP ON PINE TREES

An often unnoticed insect pest that attacks pine trees is the Zimmerman pine moth. This tree borer often goes undetected because homeowners don’t think that the sap on the trunk of their pine tree is unusual. Another problem with finding Zimmerman pine moth damage is that the foliage of the pine tree conceals the damage from view.

Zimmerman pine moth isn’t as damaging as some tree borers in Michigan, but the feeding does disrupt the vascular system of the tree. Because this borer is often present where branches meet the trunk it is not unusual to have pine branches break because of Zimmerman pine moth feeding.

Spraying to control Zimmerman pine moth is done early in the spring. Most borer sprays for this tree insect are done in April, sometimes treatments can extend into early May if we have a cool spring.

You can learn more about Zimmerman pine moth at:
http://www.owentree.com/Zimmerman_Pine_Moth.php

Zimmerman pine moth damage on white pine tree