29 Nov stigmina needle cast
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. Check the label of any pesticide referenced to ensure your use is included. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. MSU is an affirmative-action, equal-opportunity employer. Connect with Nature: Sign up for the “Conservation Talk” webinar series. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. For more information, visit https://extension.msu.edu. The article has a short history of the problem and good descriptions of spruce afflicted with problems and photos of the potential pathogen. Needle cast diseases cause spruce trees to “cast off” their older needles and keep only the young needles at the tips of the branches. 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). This information is for educational purposes only. 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. Keep in mind, there is a look a-like disease called stigmina needle cast. 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. This is why accurate … 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. This summer we began to see more Stigmina on blue spruce than in previous years. Damage typically starts on the lower branches and moves up the tree affecting susceptible spruce trees … Under the higher magnification in the lab, the fruiting bodies were obviously not Rhizosphaera, but Stigmina. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. The presence of Stigmina makes the needles look dirtier than a Rhizosphaera infected needle. Also, the Stigmina fruiting bodies called sporodochia look like little spiders while the Rhizosphaera fruiting bodies look like smooth bowling balls. 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. Another key characteristic of needl… High powered magnification is required to differentiate between the two. Blue spruce in Michigan suffers from a serious needle casting disease caused by the fungus Rhizosphaera. On this blue spruce plantation in north central Michigan, Rhizosphaera needle cast had been well managed. Pay attention to the shapes of the Rhizosphaera and Stigmina fruiting bodies because at first they can look like each other. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. 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. The... Management of stigmina needle cast. However, in some plantations needle casting symptoms still occur after sprays (Photos 1 and 2). Check the label of any pesticide referenced to ensure your use is included. The second and third year needles were turning purple or brown, dying and dropping off the stems. However, by mid-summer 2008, it looked as if the trees had a needle cast disease on the lower branches. Stigmina Needle Cast Signs and symptoms of stigmina needle cast. Symptoms progress over the course of 3 years, leading to needle... Disease cycle of stigmina needle cast. 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. Well-timed sprays in the spring will normally suppress Rhizosphaera to non-detectable levels in the population of trees. Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. This article was published by Michigan State University Extension. Early in the spring following initial infection, new spores are produced. We will be ready to study this potential new problem on blue spruce in 2009. Needle rust Year-old needles are cast after turning rust colored in the spring. Symptoms of needle cast disease.
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