Significant Needle Loss
The most common causes of significant needle loss on spruce trees are environmental stress such as chemicals in the surrounding lawn areas, insects or disease. Diseases such as needle cast (rhizosphaera or stigmina) can cause needle drop from the lower branches or the areas that tend to stay wet such as the interior, shady or wind protected areas. Which disease may require needles be examined by microscope. You can call the extension agent at (701) 241-5700 with as much information as available on any insects seen, any chemicals applied to surrounding areas including roads and description of the needles.