DO NOT attempt to use fungicide treatments to control this disease. This will prevent movement of the fungus from branch to branch, or from tree to tree during pruning. Between cuts, be sure to clean your pruning shears by dipping them for at least 30 seconds in a 10% bleach solution or 70% alcohol (spray disinfectants that contain at least 70% alcohol can be used). How do I save a tree or shrub with Cytospora canker? Immediately remove and destroy any diseased branches, by pruning them using the 3-point method of pruning (see University of Wisconsin Garden Facts XHT1014 for details). Spores of the fungus are spread by wind, rain splash, insects, birds and mammals. Where does Cytospora canker come from? Cytospora canker is caused by the fungus Leucocytospora kunzei (also referred to as Leucostoma kunzei), which survives in infected branches. Infected branches often produce a bluish-white sap that oozes somewhere along their length. Diseased needles eventually fall off and the infected branches die. Needles on infected branches turn purple, then brown and die. Individual upper branches may show symptoms as well. What does Cytospora canker look like? Cytospora canker usually first appears on lower branches and progresses up the tree. Trees that are 15 years old or older and are at least 20 feet high most typically show symptoms of this disease. This disease can also affect Norway spruce (and less frequently other spruces) as well as Douglas-fir and balsam fir. ![]() What is Cytospora canker? Cytospora canker is one of the most common fungal diseases of Colorado blue spruce. ![]() Death of lower branches of Colorado blue spruce typical of Cytospora canker.īrian Hudelson, UW-Madison Plant Pathology, UW-Extension
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |