- All fruit trees, especially stone fruits, apple, and pear
- Many other woody plant species
The flatheaded apple-tree and pacific flatheaded borers are usually only a problem when trees are stressed by drought conditions or when populations are high in an area, such as a stack of infested firewood nearby. The larvae feed under the bark, and can kill young and stressed trees and those in decline. The adult beetles are active in June and July and lay eggs on the trunks of stressed trees.
Flatheaded borers overwinter as larvae inside the tree, and emerge as adult beetles in June-August (northern Utah). Adults lay eggs on bark crevices and the newly hatched larvae immediately bore through the bark to feed in the phloem layer.
- Oval-shaped exit holes
- Loose, dead bark
- The larvae can eventually girdle trunks which will kill young trees and trees with multiple attacks.
Watch for adult beetles May-July.
- Residential: imidacloprid (systemic), carbaryl, or permethrin
- Commercial: click here