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Privet Rust Mite

Aculus ligustri[3]

The privet rust mite is a microscopic eriophyid mite that feeds on privet, leaving leaves dull and distorted.[1][2]

Group
Arachnid
Order
Sarcoptiformes
Family
Eriophyidae
Sources
3 cited
Updated
2026-10-17

No licensed photo of this species is available yet; the identification notes below describe what to look for.

On this page
  1. Identification
  2. Where it lives
  3. Biology
  4. Damage and signs
  5. Health risk
  6. Control
  7. Related profiles
  8. Common questions
  9. Sources

How to identify it

  • The mites are microscopic, cigar-shaped and have only four legs, all at the front end; a hand lens or microscope is needed to see them.[1]
  • Damaged leaves turn dull and distorted and may drop; this injury, called rust, is often the first sign.[1][2]

Where it lives

A pest of Chinese and other privets; Virginia Tech lists it among the rust mites that are serious ornamental pests.[1][2]

Biology and life cycle

Mites become active soon after leaves develop in spring and multiply rapidly on leaves and green stems.[1]

Hot, humid weather crashes their numbers, and females wait out summer under old bud scales; populations build again in cool fall weather.[1]

They can develop from egg to adult in a week and spread to other privets on wind, insects and birds.[1]

Damage and signs

  • Feeding distorts leaves and can lead to defoliation.[1]
  • Unlike most mite galls, Virginia Tech notes rust mite damage can be a serious condition for the host plant.[2]

Health risk

None to people or pets.[1][2]

Control

Biological control

A fungus, Hirsutella thompsonii, and predatory mites and insects reduce populations in hot weather.[1]

Pesticides

Virginia Tech suggests insecticidal soap, neem oil or horticultural oil aimed at the free-living mites; NC State notes the mites are susceptible to some common insecticides.[1][2]

Common questions

Why are my privet leaves dull, cupped and dropping?
Privet rust mites, too small to see without magnification, are a common cause.[1][2]
When are privet rust mites worst?
In spring and again in cool fall weather; hot, humid summers knock them back.[1]

Sources

  1. NC State Extension, “Privet Rust Mite (PDIC Factsheet).” content.ces.ncsu.edu/privet-rust-mite (accessed 2026-10-16)
  2. Virginia Cooperative Extension (Virginia Tech), “Galls and Rust made by Mites (ENTO-147).” pubs.ext.vt.edu/ENTO/ENTO-147/ENTO-147.html (accessed 2026-10-16)
  3. iNaturalist, “Aculus ligustri taxon page (order and family).” www.inaturalist.org/taxa/960290 (accessed 2026-10-06)

Updated 2026-10-17. Built from sourced records. Spot an error? Tell us.