I have noticed a few things in general, however. https://gardening.usask.ca/.../why-is-my-evergreen-turning-brown.php I keep a very close eye on my trees and shrubs and try to react fast if I see a problem. Today however, I just noticed that the top leader is turning light green to brown. It didn't seem to be getting any worst but then I read spuceman's post. I read somewhere that these bugs do not fly well and often crawl up the tree trunks, making some kind of barrier a possibility. Zone=5 Stevensville, MT2 Blue Spruces planted last year mid June.Faired well until just about the time the grasshoppers appeared, pre-heat. The needles turn yellow or brown first, before dropping to the ground. If trees are also showing signs of insect or disease and have few needles, it may not be worth treating if the plant is in severe decline. Of course if after you do your own research on these two kinds of pests you have any doubt, you can take the grubs, and/or the damaged shoot, to someone to identify. It depends on the cause of the problem and the severity of the symptoms. Spruces can suffer from Rhizosphaera Needle Cast, a fungal disease that causes needles on spruce trees to turn brown and drop, leaving bare branches. Is it too much water or mites or somethingelse. If 1/2 of the tree is dead, would you really do any further damage if you just cut it off. I live in Jackson, NJ so I guess you can say White Pine Weevil does attack Blue Spruce here. Stress symptoms may not appear for two to five years after the stress occurred. For example, Colorado Blue Spruce are very sensitive to prolonged exposure to standing water, a leading cause of water stress leading to extreme needle drop. Water in the soil that has a high concentration of soluble salts is said to be saline and causes salinity. Read on to find out why your pine or spruce is browning and what you can do to save it. Or is the tree just in need of some TLC? Fifty percent of soil is generally minerals and other materials, 25% is water and 25% is air space. All of these things interfere with the uptake of water, oxygen and nutrients. I have seen this kind of attack/pattern literally hundreds or really thousands of times on my 20 acres of spruce trees over the years. One or two others assured me that in at least some parts of the country white pine weevil does, indeed, attack blue spruce. In cedars, it’s normal for older branchlets to turn brown. Does white pine weevil ever hit Blue Spruce? Winterkill, delayed winter injury, heat stress may cause damage to the cambian layer just beneath the bark. My primary reason for thinking white pine weevil is the site of the attack--the leader shoot only--last year's growth--and the pattern and timing of death at the top, with this year's shoots dying after they have grown for a few weeks as their supply of sap and nutrients is cut off. What causes this? The topsare starting to curl up and some branches on the ends areturning pink and the needles are falling off. If you make a lengthwise slice through the stem you can see what was going on inside better, and maybe see more clearly if any grubs are left inside. I do see the dieback of the top of the center tree. I have never seen them on conifers here.BUT...I have also never seen WPW grubs boring into the center of a new shoot...they have always been feeding on the cambium/vascular system. For me with so many spruce trees and such constant attacks, I have generally done little or nothing, as I said before. Prolonged exposure to standing water causes damage to the root hairs of the trees – these are specialized, very fine roots which are responsible for water, nutrient and oxygen uptake in the trees. I have done a search on shot-hole borers and can find no reference to a special and restricted site of attack like this nor the timing and pattern of damage/death. Recently, several reports of evergreens turning brown have come in from around the state. http://umanitoba.ca/faculties/afs/hort_inquiries/leaf%20drop%20evergreens.html, http://www.mortonarb.org/trees-plants/tree-and-plant-advice/horticulture-care/decline-trees-and-shrubs, https://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex4144, © University of SaskatchewanDisclaimer|Privacy, https://gardening.usask.ca/articles-trees/planting-practices-that-harm-trees-and-shrubs.php, http://extension.wsu.edu/benton-franklin/wp-content/uploads/sites/27/2013/12/Purple-Needles-on-Spruce-Trees.pdf?x56665, Physical disorders of tree – a troubleshooting survey. Where (if) do I cut the damage off, and do I check for grubs with a perpendicular cut to damaged area? Why is the tree turning brown? evergreen between river birch and blue spruce - see pic. I have a blue spruce that is about 40 years old and maybe 30 feet tall. If I knew when these bugs will emerge from the ground the next spring I have imagined some kind of temporary but impenetrable barrier cloth under last year's infected tree(s) might frustrate them, but this is just my own invention and I have not tried it.

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