Arborist b 480-969-8808 Warner has been treating sick trees for over 50 years. If you look to the left there are links to our websites on Citrus Trees - Palo Verde Trees – Pine Trees – Queen Palms and the Warners Tree Surgery Website. There is also a link to our YouTube channel.


Tree service for Ash tree diseases

Carpenterworm in sick ash trees


The most common ash borer in South Dakota is our native clearwing ash borer (Podosesia syringae). This insect makes an exit hole about the size of a pencil (1/4 inch) and usually the ground beneath the holes is covered with powdery sawdust. The galleries are often found deep within the wood, rather than just beneath the bark, and they are usually clean of material.
Above: Carpenterworms are among the most common pests in ash trees.

Carpenterworm (Prionoxystus robiniae) is another common boring insect of ash trees. This insect creates an exit hole about 1/3 inch in diameter, slightly larger than a pencil. There will often be sawdust around the hole and on the ground beneath the tree. Sap may also be oozing from the holes and sometimes the empty pupal case left by the emerging adult insect can be found attached to the bark surrounding the exit holes. Above: Exit holes left by carpenterworms appear slightly larger than a pencil.

The galleries may be 5/8 inches wide, often empty of sawdust and extending deep into the tree. Trees infested by carpenterworms often have their branches weakened by the extensive tunneling, and affected branches often break off in high winds. Woodpecker activity is also common on trees infested by carpenterworms.

Above: Carpenterworms and clearwing borers can sometimes appear in the same tree.

It is possible to find both carpenterworms and clearwing borers tunneling in the same tree as the picture above shows. The clearwing ash borer larva, the one to the left, is about 1-inch long (at maturity) and is creamy white with a shiny brown head. The carpenterworm larvae, the one on the right, can become almost 3-inches long at maturity and is pinkish-white with a dark head. The clearwing ash borer has a one-year life cycle so you will typically only find the larvae in a tree from June to the following May. Carpenterworms may have a three-year life cycle so it is common to find larvae of various sizes at almost any month of the year.


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