Historically, Cytospora canker of quaking aspen was thought to be caused primarily by Cytospora chrysosperma.However, a new and widely distributed Cytospora species on quaking aspen was recently described (Cytospora notastroma Kepley & F.B. Although the disease is found on many hosts, the fungi responsible may be host specific. Colorado blue spruce is the most common host for Cytospora in Sioux Falls. Check out the following extension fact sheet about Cytospora Canker (Black Canker) entitled Cytospora Canker by … 230 Mclntyre et al. A spectacular transformation sweeps across the high, wild places of U.S. Department of Agriculture plant hardiness zones 1 … Typically, sooty-bark canker kills more mature aspen trees than any other agent (this is not the case during unusual episodes of aspen mortality such as from 2004 to 2009). The aspen tree is afflicted by many diseases, though not all are fatally harmful. Reeves). Cytospora canker: The fungus that causes this canker is weakly parasitic and normally attacks stressed trees. Hypoxylon Canker on an Aspen Tree. Cause Cytospora chrysosperma has been reported from all three Pacific Northwest States. This post lists a few common aspen tree diseases, and ways how to treat them. : Cytospora Canker on Aspen than the 500 ml_ per week, when they appeared wilted or when water potential (WP) measured less than -2.0 MPa, so that the plants' water potential would be more stable. Here, we show the relative pathogenicity, abundance, and frequency of both species on quaking aspen in portions of the Rocky … 10 Common Diseases in Aspen Trees and How to Treat Them. In surveys, sooty-bark canker was responsible for Black canker is treated by trimming out the infected branches. Poplar (Populus spp.)-Canker. The domestic plantation of aspen trees has increased in recent times. Cytospora Canker can infect many tree species. Although C. chrysosperma is the most common canker fungus on aspen throughout the tree's range, the fungus often is associated with other, more aggressive canker fungi. When cutting out the affected areas, disinfect your tools with 5-10% chlorine bleach between cuts. Colorado blue spruce, native to a dry climate, is highly susceptible to fungal disease when planted in areas of the country with high humidity. Sooty-bark canker is the most widespread, damaging canker of aspen in Colorado and probably other Rocky Mountain states. Cytospora can affect a variety of trees, including cottonwood, willows and spruce. This disease is widespread and common on poplar, cottonwood, aspen, and willow; occasionally on mountain ash, maple, and cherry. The differential in WP be-tween treatments was maintained from 1 week prior to wounding until conclusion of the experi-ments.