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THE GARDEN SAGEA library of living things
Wildlife & landscape pests · Western North Carolina field companion

Spruce spider mite

Oligonychus ununguis

Spruce spider mite on conifer foliage
Spruce spider mite on conifer foliageUSDA Forest Service - Northeastern Area , USDA Forest Service, Bugwood.org ↗ · Public domain
Photo contextA magnified view; use a lens or a white-paper tap test to check for live mites.

A conifer may show summer browning from mites that fed during cooler weather.

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In the landscape.

Plants & places

Spruce, fir, hemlock, arborvitae, juniper, and other conifers.

Recognize the damage

Fine needle stippling and bronzing, sometimes noticed after the main feeding period.

Before you act

Tap affected branches over white paper and check for moving mites before deciding whether treatment is useful.

A sensible first response

Monitor living populations, support plant health, and conserve predatory mites. Seek advice before treating discolored foliage when no active mites are found.

When to look

Often active in spring and fall; mountain temperatures can alter the pattern.

In Western North Carolina

Especially relevant to the region's conifers and Fraser fir plantings; do not assume all spider mites are warm-weather pests.

Identification, lookalikes & further notes

Identification

Tiny mites and eggs occur on needles and twigs; species confirmation needs magnification and host context.

Lookalikes & limits

Drought, root problems, and other mites can brown conifers. Old injury does not prove live mites remain.

In the garden

Fine needle stippling and bronzing, sometimes noticed after the main feeding period.

What would help next

Record the host plant, date, fresh damage, and a clear photograph of the animal or insect. A damage match narrows the search; it does not establish an identification.

Your margin of the garden.

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