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Barberry (Berberis)-Lecanium scale Toumeyella See: Common Pests of Nursery Crops Pest description and crop damage Lecanium scale are about 0.125 inch in diameter and vary from red to dark brown in color. They are oval and raised, resembling small helmets ...

Christmas tree (Common pests)-Conifer aphid Cinara occidentalis and Cinara abietis Pest description and crop damage C. abietis are large, dark aphids typically feeding on upper stems and tended by ants. May distort stems. C. occidentalis feed at the base ...

Christmas tree (Common pests)-Eriophyid needle mite Epitrimeris spp. and others Pest description and crop damage Very tiny, white, worm-shape mites found along stem and needle bases. Infested foliage takes on an olive-green color; older needles drop prema ...

Christmas tree (Common pests)-Root weevil (adult) Strawberry root weevil (Otiorhynchus ovatus) and others Pest description and crop damage Larvae are cream-colored, C-shaped grubs that feed on roots, sometimes girdling them. Adults feed on Douglas-fir and ...

Christmas tree (Common pests)-Spider mite Oligonychus ununguis and others Pest description and crop damage Dark green mite stipples and bronzes needles, beginning at the base. Overwinters as red-orange eggs. Management-chemical control abamectin (Avid, Mi ...

Christmas tree (Common pests)-Spruce budworm Choristoneura fumiferana Pest description and crop damage Green-brown larvae up to 1 inch long feed on foliage and buds of fir, spruce, and Douglas-fir. Management-chemical control Apply May-June or when bud fl ...

Christmas tree (Common pests)-White grub Includes Ten-lined June beetle (Polyphylla decemlineata) Rain beetle (Plecoma spp.) Aphodius spp. Pest description and crop damage Small to large C-shaped, white scarab beetle larva with six legs and a brown head. ...

Christmas tree (Douglas-fir)-Black pineleaf scale Nuculaspis californica Pest description and crop damage Gray-black scale. Hosts: Douglas-fir and pine. Management-chemical control azadirachtin (AzaDirect and others)-Some formulations are OMRI-listed for ...

Christmas tree (Douglas-fir)-Coneworm Dioryctria spp. Pest description and crop damage Small creamy-brown moth larvae bore into stems, especially around wounds. Management-chemical control Applications must be made before eggs hatch and larvae tunnel into ...

Christmas tree (Douglas-fir)-Cooley spruce gall adelgid Adelges cooleyi Pest description and crop damage Adelgids appear as small cottony tufts on underside of needles. May cause yellowing, distortion, and premature needle drop. Aphids may distort stems. ...