![]() ![]() Maintained by Bill Cook, MSU Extension Forester for the Upper Peninsula of Michigan.Įditing and modification is ongoing. Anderson, USDA Forest Service, Īll others - Bill Cook, Michigan State University ExtensionĬlick HERE to return to the Forest Health home page. White Pine Blister Rust - Joseph O'Brien, USDA Forest Service, Sirococcus Blight - Joseph O'Brien, USDA Forest Service, Ĭhrysomyxa Rust - USDA Forest Service - North Central Research Station Archive, USDA Forest Service, Rhizosphaera Needlecast - USDA Forest Service - North Central Research Station Archive, USDA Forest Service, Milwaukee : Spruce (White) Transplant Shock (Suspected) None. Skilling, USDA Forest Service, Ĭyclaneusma Needlecast - Joseph O'Brien, USDA Forest Service, Spruce (Blue) Rhizosphaera Needle Cast (Suspected) Rhizosphaera kalkhoffii. Hosts: all conifers, often species or genus specific diseases - Scots pine (brownspot, Cyclaneusma, others), spruces or firs (Rhizosphaera, Chrysomyxa), red pine (Coleosporium, Sphaeropsis, Sirococcus), cedar (Phomopsis), white pine (w.pine blister rust), balsam fir (Lirula)īrownspot Needlecast - Darroll D. Needlecast s and rusts (several genera): browning needles of various shades can indicate needlecast disease, usually not fatal, can render Christmas trees unsaleable, growing site can be dignostically important, browning pattern important (top down, inside-out, etc.) Fortunately, some of these diseases are preventable by taking the correct precautions. Identify the insect, disease or nonliving factors that are causing problems in your garden with the UMN Online Diagnostic Tool What’s wrong with my plant or send a diseased plant sample to the UMN Plant Disease Clinic. Needlecasts & Rustsįor Christmas tree pests, refer to MSU Bulletin E-2676 "Christmas Tree Pest Manual", 143 pages. As with most tree species, diseases cause a substantial amount of damage to either the roots, stem, or leaves of the tree. Leaf spots, fruit rot, wilt and unusual plant growth or color can all be symptoms of a plant disease problem. Interior needle blight, which is the most severe foliar. Lirula Needle Blight: This can cause graying of the needles and in some cases of infection, black bands across the affected needles. Spruce Needle Blights Lirula macrospora Hartig Darker Lophodermium picea Fuckel Hhn. Also winter injury can cause browing, usually in June. three most common diseases were interior needle blight, purple needle eater, and Lirula needle cast. Several of the common vascular diseases are mentioned here, but properly belong in the stem and branch disease section. White pine blister rust is especially stem disease common. Wilting and browning needles often result from a disease of the tree's vascular system (trunk/branches), unseen under the bark. Lirula needle blight, more common in coastal forests, was found on Sitka spruce at ten sites across Southeast Alaska this year. The following year, the infected needles develop a black line on them. These affected needles turn yellow or brown in late summer. Lirula needle blight is a fungal disease that first presents on two-year-old needle growth. Eliminating insects, then a pathogen may be the next likely cause. Lirula needle blight generally occurs on lower branches of blue spruce. Close examination of an affected needle (several samples are better) will usually show a lack of insect presence. In subsequent years, the needles stay attached but turn purple to gray. Of course, these are symptoms similar to many insect infestations and nutrient stresses as well. Lirula needle blight is a fungal disease that first presents on two-year-old needle growth. Symptoms generally include browning, discoloration, small growths, and needle drop. ![]() Despite the structural and physiological defenses of a needle, pathogens frequently invade needles. Used singly or in group plantings in recreation areas and public grounds.Leaves hold a great amount of nutrients, sugars, and other food resources that attract a wide range of pathogens. Wood - Used for dimension lumber, pulpwood and Christmas trees. Medium to tall conifer for farmstead and field windbreaks. Common insect pests include spider mite, spruce needle miner, pine needle scale, yellow-headed spruce sawfly, and aphids. Fungicides can be used to protect new needles on trees that are infected with Lirula needle blight and on neighboring spruce trees. Better adapted than White Spruce (Picea glauca) which is native in the eastern United States, as far west as Minnesota.Ĭommon diseases include Lirula needle blight. Black Hills Spruce is a naturally occurring variety of white spruce native to South Dakota. lirula needle blight on Picea Picea abies © Andrej Kunca, National Forest Centre, Slovakia parasite Shining, black apothecia at the undersides of the needles. A large tree, very dense and pyramidal when young. ![]()
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