Bug FAQNemorimyza posticata
Nemorimyza posticata · Order: Diptera · Family: Agromyzidae
Adult Nemorimyza posticata are tiny flies about 2.5 to 3 mm long. They have a matte black area between the eyes, a soft black lunule, black antennae and palps, a brilliant black thorax, brown-black legs with yellow knees, and a whitish-yellow haltere knob. Females have a black abdomen with the last two segments brown, while males show a darker base and a yellow remainder.
Source: Wikipedia
How to recognize it
Interocular space is matte black; lunule is soft black; antennae and palps are black; mesonotum is brilliant black; legs are brownish black with yellow knees; haltere knob is whitish yellow. Female abdomen is black with the last two segments brown; male abdomen has a dark base and yellow rest.
Source: Wikipedia
Size
Length ranges from 2.5 to 3 mm.
Source: Wikipedia
Where it lives
It belongs to the Agromyzidae family of flies. The species occurs in the Palearctic region.
Source: Wikipedia
What it eats
Larvae mine the leaves of Solidago, Aster, Baccharis and Erechtites.
Source: Wikipedia
Life cycle
The larval stage mines Solidago, Aster, Baccharis and Erechtites.
Source: Wikipedia
Where it comes from
Its native range is the Palearctic.
Source: Wikipedia
Where it is found in the US
Recorded in 39 of 51 states and DC. Most records: New York, Vermont, Pennsylvania, Wisconsin, Maryland, North Carolina, Massachusetts, Louisiana.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
What plants do the larvae of Nemorimyza posticata affect?
The larvae mine the leaves of Solidago, Aster, Baccharis and Erechtites.
Source: Wikipedia
Same family (Agromyzidae)
European Holly LeafminerPhytomyza ilicis
Jewelweed Leaf-miner FlyPhytoliriomyza melampyga
Agromyza vockerothiAgromyza vockerothiDamages trees, gardens or crops
Calycomyza flavinotumCalycomyza flavinotum
Dogwood leaf-mining flyPhytomyza agromyzinaDamages trees, gardens or crops
Ophiomyia mauraOphiomyia mauraSources
- Wikipedia: https://en.wikipedia.org/wiki/Nemorimyza_posticata
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.