Black Walnut in Nebraska Thousand Cankers Disease Nebraska Forest Service Information Black walnut is native to the eastern part of Nebraska where it is commonly found along Black walnut is highly susceptible. English river and stream walnut, butternut and other walnut species Restrictions on corridors. The tree show varying degrees of susceptibility. is also widely Moving Walnut Wood planted across the Pecan and hickories are resistant. state for nut and Symptoms include yellowing foliage timber production, followed by brown wilted foliage, branch for wildlife habitat, dieback and tree death. and in certain Tree death occurs 2-3 years after initial community and symptoms appear. rural landscapes where a tough, Trees may be infected for many years drought-tolerant without visible symptoms. tree is needed. No effective chemical controls are known. TenSilver fordrangerforum.com Nebraska Black Walnut Facts For more information contact: 1.5 million trees Nebraska Department of Agriculture What you need to know 301 Centennial Mall South about 40 million board feet of merchantable wood P.O. Box 94756 • Lincoln, NE 68509 www.agr.ne.state.us (value: $40-80 million) Nebraska’s Nebraska Forest Service 1 million board feet harvested annually Forestry Hall, University of Nebraska Walnut Quarantine (value to state’s economy: $3.5 million) P.O. Box 830815 • Lincoln, NE 68583 www.nfs.unl.edu 4,000 commercial nut-bearing trees The movement of walnut wood into 70,000 pounds of nuts produced annually Nebraska from other states is restricted by (value to state’s economy: $1.2 million) Laurie Stepanek Nebraska Forest Service law. Walnut logs, firewood, green lumber, woodchips and nursery trees are among the walnut products included in this quarantine. This brochure discusses the purpose of the quarantine and its restrictions, which will help protect the walnut industry and the native and planted walnut trees of our state. Native range of black walnut The University of Nebraska–Lincoln FH12b-2011 is an equal opportunity educator and employer. Why is there a walnut Which walnut items are Which areas are quarantine? restricted from movement? quarantined? A new disease known as “thousand cankers disease” The quarantine applies to all species of walnut trees Any state known to be infested with thousand has killed many walnut trees in several western (Juglans species) and includes both living and dead cankers disease is included in the quarantined states. The purpose of this quarantine is to prevent material: area. Regulated walnut items originating the spread of this disease into Nebraska’s native and from these areas may not be brought into logs planted black walnut. or transported through Nebraska. boards The table below includes the states under green lumber quarantine as of the date of this publication. firewood Additional states may be added as new branches, stumps, roots infestations are discovered. burls Quarantined Areas* bark, mulch, chips Regulated walnut items originating from these wood packing material danville-california.olx.com areas may not be brought into Nebraska. nursery stock Arizona New Mexico Black walnut trees in Colorado killed budwood and scionwood California Oregon by thousand cankers disease. firewood or fuel wood of any non-coniferous Colorado Tennessee (hardwood) species Idaho Utah The fungus that causes thousand cankers disease is Nevada Washington spread by the walnut twig beetle, a tiny black Additional restricted items: and any other known infested area beetle that feeds under the bark. The beetle and the fungus are easily transported in infested walnut all life stages of the walnut twig beetle *As of January 2011. wood. the fungal pathogen that causes thousand cankers disease Walnut grown in Nebraska is not under the The walnut twig beetle quarantine and may be moved within the is extremely tiny. state. Other states, however, may prohibit the Non-restricted items importation of Nebraska walnut. Contact the Nebraska Department of Agriculture for The following items are not included in the more information (see back panel). Whitney Cranshaw Colorado State University quarantine: All nuts, nut meat, and hulls Processed lumber (100% bark-free, kiln dried, with squared edges) Finished wood products Whitney Cranshaw Colorado State University without bark, including walnut furniture, Diseased walnut wood is highly infectious. instruments and gun stocks The vial contains 23,040 walnut twig beetles, This walnut log in Denver, Colorado, which emerged from these two logs. cannot be transported into or through Nebraska. .