of Agriculture, Food and Forestry 2800 N. Lincoln Blvd. Attacks hardwoods - Fire blight is a serious disease of apple and pear. The disease results from the walnut twig beetle (Pityophthorus juglandis) hosting a canker producing fungus in the genus Geosmithia (proposed name Geosmithia morbida). Although roots from trees cut or killed many years ago continue to produce sprouts that survive to the sapling stage before being killed, there is no indication that a cure for this disease will be found. Remove dead, diseased or damaged branches. The most common virus disease is currant mosaic. The fungus Cronartium fusiforme requires an alternate host to complete its life cycle. American elm is highly susceptible. Citrus longhorn beetle (Anoplophora chinensis) 5. Unfortunately, it has now been found in eastern Tennessee. It has a wide host range including oaks, maples, hackberry, ash, sweetgum, locust, elm, mimosa, and willows, and is found throughout hardwood forests. Heartwood decay is the most serious form of damage, but the fungi also kill the cambium and decay the sapwood for as much as 3 feet above and below the canker point into the tree. Powdery mildew – white velvet mold develops on all or part of the plant, most especially on leaves. Lack of water can cause a wide range of issues including: To protect your trees from the effects of drought, start by choosing species that will grow well in your conditions and follow basic tree watering guidelines. Diplodia tip blight. Attacks conifers - Trees favored by dwarf mistletoe (Arceuthobium sp.) Currant blister aphid is common on red, white and black-currants. Learn the distributions, life cycles and management options for the pests, plants and diseases that impact them. A mysterious disease is striking American beech trees. Aphids – leaves lose their original color and curl themselves into tube shapes. Damage is most severe on longleaf seedlings in the grass stage. Tree diseases and pests vary tremendously from region to region, and what’s ailing a tree is often difficult to diagnose. He is a member of the Society of American Foresters. Save For Later Print The taxonomy of some of these organisms has changed in recent years and several scientific and common names are in use. Spores from the fungus can be spread by rain and wind. Fungus infection results in clogging of vascular tissues, preventing water movement to the crown and causing visual symptoms as the tree wilts and dies. Affected trees have reduced growth rates and usually die within 6 years. Elytroderma needle cast has also been reported in North America on lodgepole, big-cone, jack, Jeffrey, knobcone, Mexican stone, pinyon, and short-leaf pine. Emerald ash borer (Agrilus planipennis) 7. [8] The blackcurrant leaf midge can cause browning, crimping and distortion of leaves at … Attacks hardwoods - An anthracnose fungus, Discula sp., has been identified as the causal agent for dogwood anthracnose. Seedlings are in greatest danger. The Armillaria sp. "Weeping" sap from the rotting point is what you are seeing. Oak wilt Oaks continue to be at risk from gypsy moth defoliation and oak wilt disease, while beech bark disease continues to expand and threaten beech populations. Stubborn disease Identification tip: Young trees affected by stubborn disease are stunted and produce undersized and few fruit. The most susceptible hosts are Pacific silver fir, white fir, grand fir, Douglas-fir, and mountain hemlock. Root knot nematode » Current Pests & Diseases ... as the sap seeping from wounds might attract insects that could spread the disease. Disease Descriptions for Gooseberries and Currants The more common diseases found on currants and gooseberries are anthracnose, leaf spot, and powdery mildew. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website. Attacks hardwoods - Oak wilt, Ceratocystis fagacearum, is a disease that affects oaks (especially red oaks, white oaks, and live oaks). Sign up for, and read previous editions of, the Forestry Commission’s Tree Health News newsletter. Rust – brownish-orange blisters appear on the underside of leaves. White pine weevil. Diplodia is a common disease of Austrian and other pines. This disease can kill twig tips, expanding to buds, new shoots, and leaves. Many of the species are plant diseases of major economic importance, causing significant damage. On these hosts, the fungus causes a bleeding canker on the stem. It has invaded most white pine areas and is still making progress into the Southwest and into southern California. Others have been devastating to forest tree communities and single tree species. This bleeding is a protective slow, natural draining effect on a destructive organism that needs a dark, damp environment with favorable culturing conditions at summer temperatures. White Pine Blister Rust This fungal disease affects two hosts -- currant plants and white pine trees. The fungus is widespread and continues to survive as a non-lethal parasite on chinkapin, Spanish chestnut, and post oak. One of the more common issues affecting trees across the country is drought. Newsletters, Factsheets and Identification Assistance Resource listings for tree and insect identification, sick tree diagnostics and other information. The decay, called annosus root rot, often kills conifers. Beech Leaf Disease - Beech leaf disease affects and kills both native and ornamental beech tree species. Dogwood anthracnose symptoms are brown, stunted new shoots with short, brown needles hosts -- plants... 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