I am afraid the disease may be back this year. Last summer their was no shedding. 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. Use it according to label directions. Your advice was helpful. The pines are doing fine. 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. Some diseases can only be identified in the laboratory. When considering spruce trees; blue spruce is the most common and most susceptible host of Rhizosphaera spp, followed by black hills spruce. I referenced a North Dakota State article on the internet and the needle cast disease does not look like Rhizosphaera but more like the Stigmina lautii. It may be worth your while to have a certified arborist make an on-site inspection instead of throwing good money after bad. I planted a new shelterbelt in 2017. My experience from two summers ago is the disease will keep spreading throughout the summer as long as favorable conditions for the disease continue. 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). Symptoms of both needle cast diseases look similar to each other. Norway spruce would be a less susceptible tree. I will attempt to spray with chlorothalonil but don't get my hopes up is what your saying. I am sure it is too late for the needles starting to turn the brownish color but hopefully I can limit the spread somewhat. Other conifers including pine, fir and cedar are rarely infected with Rhizosphaera. http://msue.anr.msu.edu/news/stigmina_found_associated_with_needle_cast_on_blue_spruce_in_michigan A 2017 fact sheet from Extension University of Illinois states there is no known treatment: http://extension.illinois.edu/focus/index.cfm?problem=stigmina-needle-blight I read the same 2011 article from North Dakota that you reference and it states to use the same fungicide that is used for needlecast. It affected about two thirds of the trees and needles sluffed was from 5 percent to 33 percent with it not being very uniform. I should have mentioned that I have not been able to see any fruiting bodies but I will look again right away this morning. 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. Similarities and differences between the two diseases exist. The shedding was spread out throughout the tree but more to the newer upper branches. Trees affected by Rhizosphaera needle cast. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. I noticed that some of the needles are now turning a more brownish color. Another key characteristic of needl… 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. The needles two summers ago turned a purplish brown color before they fell off. 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 can still spray them with my lawn sprayer. If you think it is a fungal needle cast disease, I would like to know fungicides to use timing and amounts. I estimate about 6 to 7 percent of the needles shed on all the trees. They were planted 25 feet apart. I can use a wand and spray the tree from top to bottom from both sides of the row with a fine stream and get decent coverage The trees are about eight feed tall. I estimate about 6 to 7 percent of the needles shed on all the trees. I will look on the stems as well for the third fungus the article describes. You will need a magnifying glass to examine the needles. I live in the southwest corner of Minnesota.

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