Green Tech Tree

Insects Control & Tree Diseases

Dogwood Borer

tree care insect control The dogwood borer (DWB), a native clearwing moth, can be found from southeastern Canada to Florida, and as far west as the Mississippi. The insect has a wide host range including dogwood, pecan, oak, plum, and apple. The DWB has one generation per year throughout its geographic distribution. On apple, DWB larvae feed primarily in burrknot tissue on clonal rootstocks. Burrknots are aggregations of root initials which can develop on the above ground portion of the rootstock. All commercial dwarfing and semi-dwarfing rootstocks have a tendency to develop burrknots.

The DWB adult has a wing span of 18-22 mm. Both the fore and hind wings are mostly clear. The thorax and abdomen are deep blue-black with yellow markings. In the female, the entire 4th abdominal segment is yellow, while in the male it is black with a narrow yellow ring. In the Northeast, adult emergence begins in early June and continues into early September, peaking in mid July. Emergence begins earlier further south.

The eggs are light chestnut brown, oval, 0.6 by 0.4 mm, and are marked with a hexagonal pattern of slightly raised lines. Eggs are laid singly on the trunk, and hatch after an incubation period of 8-9 days.

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