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Christmas tree (Douglas-fir)-Douglas-fir needle midge Contarinia spp. Pest description and crop damage Adult is a small midge (fly). Larvae mine needles; they often appear as a purple node above which the needles are distorted. Degree day models and traps ...

Christmas tree-Twig weevil Cylindrocopturus furnissi Pest description and crop damage Small gray-black weevil with white mottling, sometimes with pink or orange spots. It may kill small branches and sometimes small trees. Traditionally thought to infest o ...

Christmas tree (Douglas-fir)-Pine needle scale Chionaspis pinifoliae Pest description and crop damage White scale flock needles. Hosts: Douglas-fir and pines. Eggs hatch May or June, perhaps July. Management-chemical control Apply to crawler stage. azadir ...

Christmas tree (Douglas-fir)-Tussock moth Includes Douglas-fir tussock moth (Orgyia pseudotsugata) Rusty tussock moth (Orgyia antiqua nova) Pest description and crop damage Caterpillars with tufts (tussocks) of hair. Larvae may be found in large numbers u ...

Christmas tree (Douglas-fir)-White pine weevil Pissodes strobi Pest description and crop damage A small brown weevil, roughly 0.25 inch in length, with the snout typical of other weevils. Wing covers are marked with irregular patches of brown and white sc ...

Christmas tree (Pine)-Black pineleaf scale Nuculaspis californica Management-chemical control azadirachtin (AzaDirect and others)-Some formulations are OMRI-listed for organic production. dinotefuran (Safari 20 SG) (Group 4A) horticultural oil/soap (M-Ped ...

Christmas tree (Pine)-Coneworm See: Christmas tree (Douglas-fir)-Coneworm Christmas tree (Pine) Coneworm ...

Christmas tree (Pine)-European pine shoot moth Rhyacionia buoliana Pest description and crop damage Larvae stunt and deform stems, especially terminals. The moth is established in western Washington but still relatively rare in Oregon. Sampling and thresh ...

Christmas tree (Pine)-Pine bark adelgid Pinus strobi Pest description and crop dam Appear as white, woolly mass on trunk or stem. May severely distort new growth. See table: Hosts and Symptoms of Major Aphid and Adelgid Pests of Christmas Trees Management ...

Christmas tree (Pine)-Pine needle scale Chionaspis pinifoliae Pest description and crop damage White scale flock needles. Hosts: Douglas-fir and pines. Eggs hatch May or June, perhaps July. Management-chemical control Apply to crawler stage. bifenthrin (O ...