Well-timed sprays in the spring had suppressed Rhizopshaera to non-detectable levels in the population of trees. Damage typically starts on the lower branches and moves up the tree affecting susceptible spruce trees … Symptoms progress over the course of 3 years, leading to needle... Disease cycle of stigmina needle cast. Check the label of any pesticide referenced to ensure your use is included. High powered magnification is required to differentiate between the two. Dennis Fulbright, Michigan State University Extension, Department of Plant Pathology - The tree becomes unattractive and may look as though it is dying, but don’t despair. We have observed stem infection with Setomelanomma and needle infection with Stigmina on the same branch. This information is for educational purposes only. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Keep in mind, there is a look a-like disease called stigmina needle cast. Needle cast diseases cause spruce trees to “cast off” their older needles and keep only the young needles at the tips of the branches. However, in some plantations needle casting symptoms still occur after sprays (Photos 1 and 2). Also, the Stigmina fruiting bodies called sporodochia look like little spiders while the Rhizosphaera fruiting bodies look like smooth bowling balls. I want to share our 2008 observations with you because this may begin to provide some insights into a new spruce problem and what we may or may not know about it. On this blue spruce plantation in north central Michigan, Rhizosphaera needle cast had been well managed. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Symptoms of stigmina needle cast are almost identical to those of rhizosphaera needle cast. The second and third year needles were turning purple or brown, dying and dropping off the stems. Under the higher magnification in the lab, the fruiting bodies were obviously not Rhizosphaera, but Stigmina. Symptoms of needle cast disease. This article was published by Michigan State University Extension. Stigmina Needle Cast Signs and symptoms of stigmina needle cast. If you have been spraying with chlorothalonil-based fungicides and not finding acceptable control of your blue spruce needle cast problems, you may not have Rhizosphaera needle cast, it might be Stigmina. Stigmina found associated with needle cast on blue spruce in Michigan Dennis Fulbright, Michigan State University Extension, Department of Plant Pathology - September 19, 2008 Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. This was the largest amount of Stigmina on blue spruce we have seen in the state. In the photos you will be able to see typical Rhizosphaera fruiting bodies on blue spruce needles, Setomelanomma fruiting bodies on the stem of blue spruce, not on the needles, and Stigmina on the needles of blue spruce. ​While Stigmina is found on a variety of forest and landscape spruce species, blue and white spruce are most commonly infected in southern New England. The casting needles were year two and year three needles. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Needle rust Year-old needles are cast after turning rust colored in the spring. This is why accurate … The presence of Stigmina makes the needles look dirtier than a Rhizosphaera infected needle. For more information, visit https://extension.msu.edu. While we do not know much about Stigmina, we now know that what controls Rhizosphaera does not control Stigmina because either the fungicide could not handle Stigmina, or the timing of the fungicide was not appropriate for Stigmina. Early in the spring following initial infection, new spores are produced. Well-timed sprays in the spring will normally suppress Rhizosphaera to non-detectable levels in the population of trees. Blue spruce in Michigan suffers from a serious needle casting disease caused by the fungus Rhizosphaera. In the December 2006 issue, the North Dakota State University extension service publication Tree Talk, authors Jim Walla (forest pathologist) and Kasia Kinzer (plant pest diagnostician), NDSU Department of Plant Pathology, report that a fungus, Stigmina lautii had been discovered on spruce in North Dakota. Check the label of any pesticide referenced to ensure your use is included. MSU is an affirmative-action, equal-opportunity employer. The classic symptoms of needle cast include brownish purple discoloration and eventual death of older needles, while current-year needles show no symptoms (Figure 1). Prior to 1999, when Stigmina lautii was identified in North Carolina on blue spruce, this needle cast pathogen was only known from western Canada on black (P. mariana) and white spruce. 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