Common Blue Spruce Diseases Common pine tree diseases include Rhizosphaera needle cast and Cytospora canker fungus. We have Daconil fungicide (Chlorothanolil) that we want to use on infected trees but we’re not sure if we should wait for the next Spring or spray now. The agent or the supplier of the sprayer may also be of help. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil… The following website will give you details on this condition and with pictures that will help you determine if your Spruce is dealing with this condition. Needles on infected branches will turn yellow, then brown and will drop by the end of summer. Please let us know what course of action you would recommend. Apple tree rust, regular leaf fungus, even lawn fungus. 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). wet weather. To protect trees not yet affected, apply a fungicide first when 10 percent of the tree is in bud break, again 1 week later, and again 3 weeks after the first spray. Spraying too early or too late will miss the stages when the tree can be protected from infection by the fungus. If a fungicide is used, be sure to read, understand, and follow the labeled instructions to avoid injury to the tree, the environment, or yourself. Other websites with excellent information on Rhizosphaera Needle Cast: Links to other issues that plague Blue Spruce trees. Eventually needles may turn brown or purple and drop. Our blue spruce trees (7-8 years old in zone 5 just north of Toronto) have been affected by Rhizosphera (black spots on needles detected with a loupe). 4 reviews. Pruning the lower branches off will allow better air flow under the tree and dry off the needles more quickly after rain or dew events. At this time there is no known control strategy. Various online sources, including the ones cited below, suggest that appropriate fungicides can be applied every 3-4 weeks whenever conditions favour the spread of fungal spores – i.e. Hello, There are several fungal issues and diseases that Colorado blue spruce trees can develop over time that will result with needle loss and dead branches, Rhizospera needle cast is just one of them. Symptoms of both needle cast diseases look similar to each other. Some diseases are treatable and some are not. A lot of time and money has been wasted by applying fungicides at the wrong time. Our blue spruce trees (7-8 years old in zone 5 just north of Toronto) have been affected by Rhizosphera (black spots on needles detected with a loupe). Rhizosphaera is a fungus disease that tends to infect inner needles first. http://www.pestid.msu.edu/LinkClick.aspx?link=Factsheets%2fCytospora.pdf&tabid=218&mid=834 Phomopsis - The initial symptoms are very subtle, just a slight discoloration of the needles. A protective fungicide with the active ingredient chlorothalonil (sold as Multi- Purpose Fungicide, Daconil 2787, and others), Two-some, Spectro-90, or copper based fungicide can protect new growth and prevent new infections. It is quite effective. Since our trees have been showing signs of disease for few years now we’re afraid that this year’s growth is already infected and that spraying with won’t help (not sure if we can trust the arborist company or not). We had a quote from an arborist (very expensive) who recommended that they spray in August and again in September this year and then continue 3 times per year over the next 3 years. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. Even though fungicide application will effectively control this disease, reinfection may occur in subsequent years. Instead, consider planting Norway spruce, which is resistant. Product #059-3761-2. Plant & Tree Insect Protection This store is currently not accepting online orders. You may begin to notice branches dying near the base of the tree first and eventually see it progress upward. White spruce and other conifers, like pine and fir, are also susceptible. The following website will give you details on this condition and with pictures that will help you determine if your Spruce is dealing with this condition. Stigmina - Very little is known about Stigmina. Only the needles on the tips of the branches will remain. Spray the tree including the … Unfortunately the controls for Rhizosphaera do not appear to be effective for Stigmina. Rhizosphaera needlecast I have included a brief explanation of treatment from the following link. Chrysomyxa weirii: Destroy heavily infected trees. http://msue.anr.msu.edu/news/spruce_tree_problem_shows_symptoms_of_both_needlecast_and_branch_death Cytospera Canker - This fungus disease tends to infect older spruce trees. The key to successfully managing this disease requires that you protect new growth as … The following website gives some information on Stigmina. A certified arborist can diagnose your tree and make the necessary recommendations. To do so, fungicides should be applied in a timely manner at budbreak , when the new needles are half elongated, and again three to four weeks later. While spring may have long passed, it might not be too late for your trees to benefit from fungicide treatment this year, as it may still provide some reduction in the spread of the fungus to healthy parts of the trees. I hope this information helps you out in making the right decision and if you have any further questions please don't hesitate to ask.
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