The Q&A Archives: Blue Spruce and disease

Question: Good Morning. I have two Blue Spruces. One about 4 yrs and one about 3. I need to find something decent to spray them with that will not change their color, but will still keep the bugs off from killing the lower branches. Thank you Michael

Answer: Needle cast is a possible cause of the lost foliage on the lower branches. This is a disease which is spread primarily by rain water splashing the spores from infected needles to newly emerging needles in the spring. Carefully inspect the affected foliage plus the foliage directly around the affected foliage and look for tiny insect holes, webbing, etc. You need to isolate the cause of the problem before using any insecticides or fungicides. Any product with an oil base will dissolve the bloom and change the color of your blue spruce. For insect pests, try a systemic such as Bonide Systemic Insect Control or Ortho Orthene Systemic Insect Control. For diseases, try Lilly Miller Microcop Fungicide. If carefully applied at the right time of the year (check the label for directions) it should not discolor your spruce. However, you may want to spray a test area first to see how your tree reacts. If it does discolor the needles, they will remain discolored but any new growth it puts out after the spray application will be the correct color. Good luck with your spruces.

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