- Mites are extremely small, typically no larger than 1/2-millimeter in diameter.
- Mite adults and nymphs have eight legs; larvae (smallest) have six legs.
- Boxwood mites: brownish yellow.
- Southern red mites: purplish or reddish in color.
- Spruce spider mite: grayish black with a tan area behind the mouthparts.
- Two-spotted spider mite – greenish yellow with a black spot on each side of the body.
Biology and Habits:
- Except for the two-spotted spier mite, eggs, which are similar in color to the adults, are the overwintering stage on leaves and small branches. Two-spotted spider mite adult females overwinter as adults in bark cracks.
- All stages of the mite, except the egg, use their needle-like mouthparts to suck plant juices, causing tiny spots (stippling) particularly on the leaves.
- There are several generations per year.
- Boxwood mite: common, English, and European boxwood.
- Southern red mite: azalea, firethorn, holly, mountain laurel, rhododendron, rose, viburnum, and yew.
- Spruce spider mite: arborvitae, hemlock, pine, and spruce.
- Spider mites cause small spots (stippling) on the leaves or needles. Heavy infestations can cause the leaves or needles to turn pale green to yellow and drop.
- In heavy infestations, the underside of leaves may appear dusty from the empty egg casings and molted skins.