Plant: Blue Globe Spruce
Symptoms: Needles losing color, die off in center of plant.
a. spider mites.
I called Arapahoe Acres today to ask if they had an insecticide for spider mites. The lady said they have miticide that doesn’t work very well and then asked if I know for sure if it is indeed mites.
I explained the arborist suggested it may be a problem and to do the paper test.
PAPER TEST: As mites can be too small to see with the naked eye, take a white piece of paper and shake a limb over the paper. If you see tiny specs they could be mites.
UPDATE 5/26/2010: I have added a tree spike for evergreens and have been watering more heavily. There is new growth now, but the color of the needles are the same.