The SSM in Fraser fir is a small, red to almost black-colored mite. Young mites are smaller than the adults and have six legs. When immatures molt, they may appear to be dead as they go into a resting stage before they shed their old skin. Adults are larger and have eight legs. The eggs are small and round with a single hair coming up through the center.
All life stages are present through the growing season.
The SSM overwinters as an egg though during warm periods in the winter, live mites can be active. Scouting for spruce spider mites using a hand lens Similar appearing problems . Spider mite damage can be mistaken for poor color, yellowing needles or other symptoms of nutrient deficiency. Look at the needles through a hand lens to find the yellow spots and the spider mites themselves. When to scout .