Ash Bead Gall Mite on an ash leaf in Howard Co., Maryland (7/17/2014).

View Record Details Photo by Richard Orr MBP List

Ash Bead Gall Mite galls on ash in Garrett Co., Maryland (7/5/2019).

View Record Details Photo by Jim Brighton MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 412373 - Psn: 124)

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 462811 - Psn: 142)

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Frederick Co., Maryland (7/3/2021). (c) Mark Etheridge, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 496877 - Psn: 164)

Ash Bead Gall Mite in Frederick Co., Maryland (7/3/2021). (c) Mark Etheridge, some rights reserved (CC BY-NC).

View Record Details Photo by Mark Etheridge MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 475854 - Psn: 165)

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Frederick Co., Maryland (7/3/2021). (c) Mark Etheridge, some rights reserved (CC BY-NC).

View Record Details Photo by Mark Etheridge MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Baltimore Co., Maryland (10/9/2022). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 662385 - Psn: 175)

Ash Bead Gall Mite in Baltimore Co., Maryland (10/9/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Worcester Co., Maryland (6/10/2022). (c) suprof2021, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 586922 - Psn: 178)

Ash Bead Gall Mite in Worcester Co., Maryland (6/10/2022). (c) suprof2021, some rights reserved (CC BY-NC).

View Record Details Photo by suprof2021 via iNaturalist MBP List

Ash Bead Gall Mite in Harford Co., Maryland (6/9/2024). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1038727 - Psn: 178)

Ash Bead Gall Mite in Harford Co., Maryland (6/9/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Ash Bead Gall Mite in Prince George's Co., Maryland (7/26/2024). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1072445 - Psn: 182)

Ash Bead Gall Mite in Prince George's Co., Maryland (7/26/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Ash Bead Gall Mite in Talbot Co., Maryland (6/13/2023). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 823669 - Psn: 188)

Ash Bead Gall Mite in Talbot Co., Maryland (6/13/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Ash Bead Gall Mite in Harford Co., Maryland (6/9/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Ash Bead Gall Mite in Prince George's Co., Maryland (7/26/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (5/26/2025). (c) Jim Moore (Maryland), some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1263451 - Psn: 188)

Ash Bead Gall Mite in Montgomery Co., Maryland (5/26/2025). (c) Jim Moore (Maryland), some rights reserved (CC BY-NC).

View Record Details Photo by Jim Moore MBP List

Ash Bead Gall Mite in Montgomery Co., Maryland (5/26/2025). (c) Jim Moore (Maryland), some rights reserved (CC BY-NC).

View Record Details Photo by Jim Moore MBP List

Ash Bead Gall Mite in Frederick Co., Maryland (Date obscured). (c) Jim Brighton, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1055636 - Psn: 212)

Ash Bead Gall Mite in Frederick Co., Maryland (Date obscured). (c) Jim Brighton, some rights reserved (CC BY-NC).

View Record Details Photo by Jim Brighton MBP List

Ash Bead Gall Mite in Frederick Co., Maryland (7/3/2021). (c) Mark Etheridge, some rights reserved (CC BY-NC).

View Record Details Photo by Mark Etheridge MBP List

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Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

Ash Bead Gall Mite on an ash leaf in Howard Co., Maryland (7/17/2014). View Record Details Media by Richard Orr.

Ash Bead Gall Mite galls on ash in Garrett Co., Maryland (7/5/2019). View Record Details Media by Jim Brighton.

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Montgomery Co., Maryland (7/11/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Frederick Co., Maryland (7/3/2021). (c) Mark Etheridge, some rights reserved (CC BY-NC). View Record Details Media by Mark Etheridge.

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Frederick Co., Maryland (7/3/2021). (c) Mark Etheridge, some rights reserved (CC BY-NC). View Record Details Media by Mark Etheridge.

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Montgomery Co., Maryland (10/2/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Baltimore Co., Maryland (10/9/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Worcester Co., Maryland (6/10/2022). (c) suprof2021, some rights reserved (CC BY-NC). View Record Details Media by suprof2021 via iNaturalist.

Ash Bead Gall Mite in Harford Co., Maryland (6/9/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Ash Bead Gall Mite in Montgomery Co., Maryland (5/12/2021). (c) Emily Summerbell, some rights reserved (CC BY). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Ash Bead Gall Mite in Prince George's Co., Maryland (7/26/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Ash Bead Gall Mite in Talbot Co., Maryland (6/13/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Ash Bead Gall Mite in Harford Co., Maryland (6/9/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Ash Bead Gall Mite in Prince George's Co., Maryland (7/26/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Ash Bead Gall Mite in Montgomery Co., Maryland (5/26/2025). (c) Jim Moore (Maryland), some rights reserved (CC BY-NC). View Record Details Media by Jim Moore.

Ash Bead Gall Mite in Frederick Co., Maryland (Date obscured). (c) Jim Brighton, some rights reserved (CC BY-NC). View Record Details Media by Jim Brighton.

Ash Bead Gall Mite in Frederick Co., Maryland (7/3/2021). (c) Mark Etheridge, some rights reserved (CC BY-NC). View Record Details Media by Mark Etheridge.

Source: Wikipedia

Aceria fraxini

galls on a leaf, upperside

galls on a leaf, underside
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Trombidiformes
Family:	Eriophyidae
Genus:	Aceria
Species:	A. fraxini
Binomial name
*Aceria fraxini* (Garman, 1883)

Aceria fraxini, the ash bead gall mite, is a species of mites in the family Eriophyidae, the gall mites.^[1]^[2]

Ecology

[edit]

Range is North America, including southern Canada and most of the continental United States.^[2]

Mites form numerous capsule galls, greenish-yellow in color, between leaf veins of ash trees in the genus Fraxinus, including Fraxinus americana, Fraxinus latifolia, Fraxinus nigra, and Fraxinus pennsylvanica.^[3]^[4] The mites stay in the galls until late summer when host leaves mature.^[5]^: 50

The life cycle is a form of alternation of generations. An over-wintering generation consists only of females called deutogynes. The other generation consists of both sexes: females called protogynes as well as males.^[5]^: 6

References

[edit]

Wikimedia Commons has media related to Aceria fraxini.

^ "Aceria fraxini (Ash Bead Gall Mite)". iNaturalist. California Academy of Sciences.
^ ^a ^b "Aceria fraxini (Garman, 1883)". Global Biodiversity Information Facility.
^ "Species Aceria fraxini". BugGuide.net.
^ "Aceria fraxini". Gallformers.
^ ^a ^b Keifer HH, Baker EW, Kono T, Delfinado M, Styer WE (1982). An Illustrated Guide to Plant Abnormalities Caused by Eriophyid Mites in North America (Agriculture Handbook Number 573). USDA Agricultural Research Service. Archived from the original on March 13, 2014.

Taxon identifiers
Aceria fraxini	Wikidata: Q50363813 BioLib: 637006 BugGuide: 392997 EUNIS: 98788 Fauna Europaea (new): cdae4148-3a0d-42a3-a819-45dd73786965 GBIF: 4544532 iNaturalist: 542186 NBN: NHMSYS0020703356

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Ash Bead Gall Mite

Aceria fraxini

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