Field evaluations of realistic control methods are sorely needed, especially in natural, standing trees in high-productivity plantations.Ī new study published in February in the Journal of Integrated Pest Management details thousand cankers disease management approaches in commercial walnut plantations in Washington state and serves as a field test to the efficacy of these methods on an operational level. And while several strategies have been evaluated so far, nearly all have occurred in cut bolts (logs) or controlled settings. (Photo originally published in Smallwood et al 2022, Journal of Integrated Pest Management)īecause of black walnut’s value, effective management strategies are needed. Here, a canker injury is seen on a tree in Walla Walla, Washington. Stressed trees are most susceptible to thousand cankers disease, which causes lesions in the phloem, eventually hindering (and cutting off) an infected tree’s ability to transport nutrients. Stressed trees are most susceptible to this disease, which causes lesions in the phloem, eventually hindering (and cutting off) the tree’s ability to transport nutrients. Native to the western U.S., TCD was first found near Knoxville, Tennessee, in 2011 and in several other states since then, and it poses a threat to black walnuts throughout the eastern U.S. The fungus Geosmithia morbida is spread by the walnut twig beetle ( Pityophthorus juglandis). All in all, it’s an awesome tree.īut, alas, like most trees, black walnut has pest problems, specifically thousand cankers disease (TCD). The nuts are nutritious for both people and wildlife. The lumber is prized for its deep color and is used for everything from furniture to gun stocks. While folks not intimately involved in the forestry realm may only know black walnut as “that tree where nothing grows underneath it” (it’s allelopathy), black walnut is actually one of the most valuable tree species in the United States. It is a bit nutty to think about all the uses for black walnut ( Juglans nigra) trees.
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