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Solitary Oak Leafminer

Cameraria hamadryadella[3]

The solitary oak leafminer is a tiny moth whose caterpillars feed inside oak leaves, each in its own brown blotch mine.[1][2]

Group
Insect
Order
Lepidoptera
Family
Gracillariidae
US records
25 states
Sources
3 cited
Updated
2026-10-16
Solitary oak leafminer moth with bronze-blotched silvery wings
Solitary oak leafminer moth with bronze-blotched silvery wings. Photo: Samuel Paul Galick, public domain (CC0), via iNaturalist
On this page
  1. Identification
  2. Look-alikes
  3. Where it lives
  4. Biology
  5. Damage and signs
  6. Health risk
  7. Control
  8. Related profiles
  9. Common questions
  10. Sources

How to identify it

  • Larvae are tiny, flat caterpillars that taper toward the rear like a rattlesnake's rattle, about 1/4 inch long when grown.[2]
  • Each irregular blotch mine holds a single larva; hold a leaf up to the sky to see it inside.[1][2]
  • Adults are tiny, pale silvery moths with bronze blotches on the wings.[2]

Look-alikes

Look-alikeHow to tell them apart
Gregarious oak leafminerCameraria cincinnatiella, a white oak species that packs up to 12 larvae into one mine.[1]

Where it lives

Reported on oaks in New England and North Carolina; it is usually more common on oaks in natural areas than in yards.[1][2]

US map: public records from 25 states since 1990 (GBIF).

Biology and life cycle

It overwinters in fallen oak leaves (NC State says as larvae, UMass as pupae); tiny moths emerge in spring and cement eggs one at a time to the new leaves.[1][2]

NC State reports two or more generations a year in North Carolina; UMass gives 2 to 5 for the genus, depending on climate.[1][2]

Mature larvae spin a flimsy white cocoon inside the mine and pupate there.[2]

Damage and signs

  • It prefers white oaks but also attacks bur, black and red oaks.[1][2]
  • Mines turn brown, and heavy infestations cause browning and early leaf drop by late summer.[1][2]
  • In rare heavy years most of a tree's foliage can be killed, but the injury is largely cosmetic and the tree's health is rarely at risk.[1][2]

Health risk

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

Control

Sanitation

Rake up and destroy fallen oak leaves in fall, where the insects overwinter; it works best when nearby oaks are cleaned up too.[1][2]

Biological control

Parasitoid wasps and predators kill many leafminers every year; NC State puts it at 21 to 25 percent, and UMass lists at least 14 parasitoid species.[1][2]

Pesticides

NC State does not recommend chemical treatment, and UMass notes sprays are often unnecessary.[1][2]

Common questions

What are the brown blotches inside my oak leaves?
Often mines of the solitary oak leafminer; a leaf held up to the light shows the caterpillar inside.[1][2]
Will oak leafminers hurt my tree?
Rarely; the damage is mostly cosmetic.[1][2]

Sources

  1. UMass Extension Landscape, Nursery and Urban Forestry Program (Landscape Insect & Mite Guide), “Cameraria spp. (Oak Blotch Leafminer).” www.umass.edu/agriculture-food-environment/landscape/publications-resources/insect-mite-guide/cameraria-spp (accessed 2026-10-16)
  2. NC State Extension, “Solitary Oak Leafminer (PDIC Factsheet).” content.ces.ncsu.edu/solitary-oak-leafminer (accessed 2026-10-16)
  3. iNaturalist, “Cameraria hamadryadella taxon page (order and family).” www.inaturalist.org/taxa/215951 (accessed 2026-10-06)

Updated 2026-10-16. Built from sourced records. Spot an error? Tell us.