Douglas Fir: Aphids categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-26 10:31 Giant conifer aphids on pine Photo by: A.L. Antonelli Biology The aphids that infest Douglas fir are quite large—up to 1⁄5″ long. They may range in color from gray to brownish to dark. The aphids establish large colonies on […]
Douglas Fir: Coneworms categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2025-08-13 08:31 Coneworm larvae on pine Photo by: K. Grey Biology Coneworms attack Douglas fir by boring into shoot tips or stems, especially around wounds, and feeding on the soft bark tissues. The portion of the branch beyond the injured point […]
Douglas Fir: Cooley spruce gall adelgid categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-27 07:09 Douglas-fir Cooley spruce gall adelgids Photo by: A.L. Antonelli Biology This aphid-like insect feeds on newly growing needles. adelgids appear as woolly or cottony tufts on the needles, with heavily infested trees appearing “frosted” or flocked. […]
Douglas Fir: Douglas fir needle midge categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-27 07:20 Douglas-fir needle midge Photo by: R.S. Byther Biology The tiny white larvae of the Douglas fir needle midge mine the inside of needles, which become yellowed and distorted. Infested needles often have a sharp bend at […]
Douglas Fir: Douglas fir tussock moth categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-27 07:53 Douglas-fir tussock moth Photo by: R.D. Akre Biology Douglas fir tussock moth larvae start at branch tips at the top of the tree and work down, feeding mainly on the new foliage and causing severe defoliation. […]
Douglas Fir: Douglas fir twig weevil categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-27 08:31 Douglas-fir twig weevil on noble fir Photo by: Unknown Biology The Douglas fir twig weevil is a small, wingless, grayish-black beetle with white markings and sometimes pinkish spots. The adult lays eggs in twigs in the […]
Douglas Fir: Sequoia pitch moth categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-27 11:23 Sequoia pitch moth Photo by: S.J. Collman Biology The larvae of the sequoia pitch moth feed by boring into branches or trunks. At the point where the larva enters the wood, small to large masses of white […]
Douglas Fir: Silverspotted tiger moth categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-27 11:29 Douglas-fir silverspotted tiger moths Photo by: A.L. Antonelli Biology The caterpillars of the silverspotted tiger moth feed on the needles, often “tenting” branches with dirty-looking webs. Feeding occurs through fall and winter, with webs becoming more noticeable […]
Douglas Fir: Spruce spider mite categories: Conifers Douglas Fir Douglas Fir Insects Ornamentals last review date: 2026-04-28 08:10 Spruce spider mite adult Photo by: A.L. Antonelli Biology The presence of spruce spider mites is indicated by yellow or bronze stippling beginning near the needle bases. Infestations usually begin on older needles of the lower branches […]
Douglas Fir: Armillaria root rot categories: Conifers Douglas Fir Douglas Fir Diseases Ornamentals last review date: 2026-04-26 10:43 White fungal mat of Armillaria root rot infecting trunk Photo by: C.R. Foss Biology Armillaria root rot is a fungal disease transmitted between plants by root contact. Armillaria is often found in newly cleared soils or ones […]