Arborist b 480-969-8808Redheaded Banded Ash Borers

Redheaded ash borer. The redheaded ash borer (Neoclytus acuminatus) is a native insect to North America. It is a type of beetle in the “roundheaded borer” (larval name) or “longhorned beetle” (adult name) family Cerambycidae. The redheaded ash borer
develops in a wide range of hardwood and,despite its common name, is infrequently found in ash; fruit trees are more commo hosts of this insect in Colorado.

Adults of this nsect emerge from trees from June through August, cutting their way through the bark. They feed for a brief period on foliage of host plants and, after mating and maturation of the eggs, the females will lay eggs in small pits that they chew into the bark of host trees.

Upon egg hatch the newly emerged larvae tunnel into the trunks or limbs. Feeding occurs deeply into the wood, producing riddling that may extend into the center of the plant and these tunnels are semicircular in cross section. Larvae of the redheaded ash borer are cream colored with a small head marked with pronounced dark jaws. The general body for is somewhat cylindrical. They can be distinguished from larvae of the lilac/ash borer in that they lack the small prolegs on the underside of the abdomen. Larvae of the pigeon tremex, a type of horntail wasp. Perfectly round exit holes are produced when the adult of the pigeon tremex horntail emerges from the trunk.

Redheaded ash borer is almost entirely restricted to ash trees that are seriously injured or in advanced decline and it is not a primary pest of ash. Adults produce generally round, slightly semicircular, holes when exiting through the bark.i


 

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