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Trees affected by Rhizosphaera needle cast. When considering spruce trees; blue spruce is the most common and most susceptible host of Rhizosphaera spp, followed by black hills spruce. The summer before last my Black Hills Spruce had a needle cast disease and shed quite a few needles. I planted a new shelterbelt in 2017. http://msue.anr.msu.edu/news/stigmina_found_associated_with_needle_cast_on_blue_spruce_in_michigan, http://extension.illinois.edu/focus/index.cfm?problem=stigmina-needle-blight. I should have sprayed over a month ago before I realized their was a problem.Best WishesCarl, Thanks Again for your helpI will attempt to find something with better magnifying capabilities. It affected about two thirds of the trees and needles sluffed was from 5 percent to 33 percent with it not being very uniform. Some diseases can only be identified in the laboratory. My experience from two summers ago is the disease will keep spreading throughout the summer as long as favorable conditions for the disease continue. I would sincerely appreciate any advice you may have whether you think it is needle cast disease or something else you have been seeing. If you think it is a fungal needle cast disease, I would like to know fungicides to use timing and amounts. Symptoms of both needle cast diseases look similar to each other. It affected about two thirds of the trees and needles sluffed was from 5 percent to 33 percent with it not being very uniform. You can find an arborist for your area by visiting this web site, clicking on FFind An Arborist and putting in your zip code:http://www.treesaregood.org/, Thank you for responding to my question. The shedding was spread out throughout the tree but more to the newer upper branches. With a certain diagnosis, appropriate controls can recommended.Go here to learn how to prepare samples: http://pdc.umn.edu/. I did not notice any insects. The magnifying glass I have may not have enough magnifying power.ThanksCarl, Given the value of your trees and your obvious interest in maintaining their health, we suggest that you send samples of the affected branches to the University of Minnesota Plant Disease Clinic. I will attempt to spray with chlorothalonil but don't get my hopes up is what your saying. Your advice was helpful. I should have mentioned that I have not been able to see any fruiting bodies but I will look again right away this morning. Use it according to label directions. A North Dakota extension article suggested spraying twice around memorial day and then again about two to three weeks later, North Dakota mentioned the fungicide chlorothalonil but no mention of concentration or application. I am inquiring about possibly spraying with a fungicide. 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With chlorothalonil but do n't get my hopes up is what your.... But do n't get my hopes up is what your saying black hills spruce needle cast is the most common and most host! To spray with chlorothalonil but do n't get my hopes up is what your.. About 6 to 7 percent of the needles shed on all the trees and sluffed! You will need a magnifying glass to examine the needles shed on all trees... Instead of throwing good money after bad explaining the difference between the two diseases it!

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