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Arborvitae (Thuja)-Borer Western cedar bark beetle (Phloeosinus punctatus) Flatheaded cedar borer (Chrysobothris nixa) Shothole borer (Scolytus rugulosus) Pest description and damage Beetle borers are pests of many different trees and shrubs. The 0.5-inch ...

Arborvitae (Thuja)-Root weevil Includes Black vine weevil (Otiorhynchus sulcatus) Clay-colored weevil (Otiorhynchus singularis) Woods weevil (Nemocestes incomptus) Pest description and damage Identification is important: the various root weevil species di ...

Arborvitae (Thuja)-Scale insect Includes Black pineleaf scale (Dynaspidiotus (Nuculaspis) californica) Juniper scale (Carulaspis juniperi) Pine needle scale (Chionaspis pinifoliae) Pest description and damage Scale insects are small (less than 0.125 inch ...

Arborvitae (Thuja)-Spider mite Includes spruce spider mite (Oligonychus ununguis) Pest description and damage Several species of spider mites can cause damage in deciduous, evergreen, and coniferous ornamentals. Mites are all 0.02 inch or smaller. Nymphs ...

Ash (Fraxinus)-Aphid Includes leafcurl ash aphid (Prociphilus fraxinifolii) Pest description and damage Leafcurl ash aphids cause significant curling and twisting of ash leaves that provide protection for the white, waxy, 0.1-inch aphids inside. The conse ...

Ash (Fraxinus)-Ash borer Ash borer (Podosesia syringae) Pest description and damage The ash borer, also known as the lilac borer, is a larva of a clearwing moth that attacks ash as well as lilac, privet, and other members of the olive family. The adult mo ...

Ash (Fraxinus)-Carpenterworm Prionoxystus robiniae Pest description and damage The carpenterworm larvae bore in the trunk and main branches. Discolored or bleeding limbs, branch dieback, and lumpy or gnarled trunks may be indications of carpenterworm infe ...

Ash (Fraxinus)-Fall webworm Hyphantria cunea Pest description and damage These gregarious caterpillars spin web-like tents in branch tips of deciduous trees including apple, cherry, peach, pecan, English walnut, black walnut, ash, boxelder, birch, chokech ...

Ash (Fraxinus)-Lecanium scale Includes Parthenolecanium corni Pest description and damage Scale insects are small (less than 0.125 inch in length) soft insects that live beneath waxy scales. These insects are often identified by the shape and size of thei ...

Ash (Fraxinus)-Lilac leafminer Gracillaria syringella Pest description and damage The adult insect is a mottled golden yellow moth about 0.5 inch in length. The larvae that mine within the leaf tissues are small, pale yellow to green caterpillars, 0.125 t ...