http://hdl.handle.net/1813/42427 Integrated Pest Management Field Guide For Christmas Trees: Douglas Fir, True Firs, Spruce Stephanie D. Mallozzi Cornell Cooperative Extension Dutchess County 2715 Route 44 Millbrook, NY 12545 845.677.8223 ext. 104 email:
[email protected] Cornell Cooperative Extension in Dutchess County offers equal program and employment opportunities. The County of Dutchess partially funds Cooperative Extension in Dutchess County. Insects/Diseases by Tree Species True Firs: (Fraser, Canaan, White, Balsam, etc.) Spruce spider mite, Cooley spruce gall adelgid, balsam twig aphid, balsam gall midge, spider mites, white pine weevil, elongate hemlock scale Phytophthora root rot, Needle rust (Uredinopsis sp.), Canker Douglas Fir: Cooley spruce gall adelgid, Douglas fir needle midge, eastern spruce gall adelgid, white pine weevil, pine needle scale, pales weevil, elongate hemlock scale, spider mites Rhabdocline needlecast, Swiss needlecast, Armillaria root rot Spruces: Cooley spruce gall adelgid, eastern spruce gall adelgid, northern pine weevil, Pales weevil, pine needle scale, spruce bud scale, spruce budworm, spruce needleminers, spruce spider mites, white pine weevil, elongate hemlock scale, spider mites Armillaria root rot, Leucostoma canker, Rhizosphaera needlecast, Sirococcus twig blight, Weir’s cushion rust Index of Growing Degree Days (GDD) Calendar Pest GDD Plant Phenology (Time of Bloom) Balsam Gall Midge 120-299 Japanese quince Saucer magnolia Balsam Twig Aphid 30-100 Boxelder, Star magnolia Cooley Spruce Gall Adelgid