<em>Aceria ferruginea</em> on American Beech leaves in Talbot Co., Maryland (7/14/2013). (Photo ID: 7067 - Psn: 10)

Aceria ferruginea on American Beech leaves in Talbot Co., Maryland (7/14/2013).

Photo by Jim Brighton MBP List

<em>Aceria ferruginea</em> in Queen Anne's Co., Maryland (5/16/2017). (Photo ID: 80527 - Psn: 25)

Aceria ferruginea in Queen Anne's Co., Maryland (5/16/2017).

View Record Details Photo by Jim Brighton MBP List

<em>Aceria ferruginea</em> in Howard Co., Maryland (5/20/2017). (Photo ID: 77167 - Psn: 35)

Aceria ferruginea in Howard Co., Maryland (5/20/2017).

View Record Details Photo by Jim Brighton MBP List

<em>Acalitus ferrugineum</em> in Talbot Co., Maryland (6/23/2016). (Photo ID: 321023 - Psn: 35)

Acalitus ferrugineum in Talbot Co., Maryland (6/23/2016).

View Record Details Photo by Jim Brighton MBP List

<em>Acalitus ferrugineum</em> leaf galls on American Beech in Cecil Co., Maryland (6/2/2021). (Photo ID: 400067 - Psn: 35)

Acalitus ferrugineum leaf galls on American Beech in Cecil Co., Maryland (6/2/2021).

View Record Details Photo by Dave Webb MBP List

<em>Aceria ferruginea</em> in Talbot Co., Maryland (5/16/2015). (Photo ID: 73575 - Psn: 45)

Aceria ferruginea in Talbot Co., Maryland (5/16/2015).

View Record Details Photo by Jim Brighton MBP List

<em>Aceria ferruginea</em> on American Beech in Queen Anne's Co., Maryland (6/24/2017). (Photo ID: 80724 - Psn: 52)

Aceria ferruginea on American Beech in Queen Anne's Co., Maryland (6/24/2017).

View Record Details Photo by Bill Hubick MBP List

<em>Acalitus ferrugineum</em> in Howard Co., Maryland (5/3/2019). Determined by Charley Eiseman/BugGuide. (Photo ID: 191969 - Psn: 66)

Acalitus ferrugineum in Howard Co., Maryland (5/3/2019). Determined by Charley Eiseman/BugGuide.

View Record Details Photo by Sue Muller MBP List

<em>Acalitus ferrugineum</em> in Queen Anne's Co., Maryland (5/1/2021). (c) Jim Brighton, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 372098 - Psn: 76)

Acalitus ferrugineum in Queen Anne's Co., Maryland (5/1/2021). (c) Jim Brighton, some rights reserved (CC BY-NC).

View Record Details Photo by Jim Brighton MBP List

Acalitus ferrugineum in Queen Anne's Co., Maryland (5/1/2021). (c) Jim Brighton, some rights reserved (CC BY-NC).

View Record Details Photo by Jim Brighton MBP List

<em>Acalitus ferrugineum</em> in Anne Arundel Co., Maryland (6/15/2018). (c) Mark Etheridge, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 325031 - Psn: 78)

Acalitus ferrugineum in Anne Arundel Co., Maryland (6/15/2018). (c) Mark Etheridge, some rights reserved (CC BY-NC).

View Record Details Photo by Mark Etheridge MBP List

<em>Acalitus ferrugineum</em> in Kent Co., Maryland (6/29/2021). (c) Josh Emm, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 521637 - Psn: 166)

Acalitus ferrugineum in Kent Co., Maryland (6/29/2021). (c) Josh Emm, some rights reserved (CC BY-NC).

View Record Details Photo by Josh Emm MBP List

<em>Acalitus ferrugineum</em> in Garrett Co., Maryland (Date obscured). (c) Kyle Klotz, all rights reserved. (Photo ID: 825217 - Psn: 168)

View Record Details Photo by Kyle Klotz MBP List

<em>Acalitus ferrugineum</em> in Queen Anne's Co., Maryland (6/28/2022). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 746194 - Psn: 170)

Acalitus ferrugineum in Queen Anne's Co., Maryland (6/28/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

<em>Acalitus ferrugineum</em> in Harford Co., Maryland (6/30/2021). (c) Josh Emm, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 521641 - Psn: 175)

Acalitus ferrugineum in Harford Co., Maryland (6/30/2021). (c) Josh Emm, some rights reserved (CC BY-NC).

View Record Details Photo by Josh Emm MBP List

<em>Acalitus ferrugineum</em> in Montgomery Co., Maryland (12/25/2021). (c) epic2112, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 521648 - Psn: 175)

Acalitus ferrugineum in Montgomery Co., Maryland (12/25/2021). (c) epic2112, some rights reserved (CC BY-NC).

View Record Details Photo by epic2112 via iNaturalist MBP List

<em>Acalitus ferrugineum</em> in Montgomery Co., Maryland (3/12/2023). (c) epic2112, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 759106 - Psn: 175)

Acalitus ferrugineum in Montgomery Co., Maryland (3/12/2023). (c) epic2112, some rights reserved (CC BY-NC).

View Record Details Photo by epic2112 via iNaturalist MBP List

<em>Acalitus ferrugineum</em> in Montgomery Co., Maryland (5/18/2023). (c) Jane Hartman, all rights reserved. (Photo ID: 804848 - Psn: 178)

View Record Details Photo by Jane Hartman MBP List

<em>Acalitus ferrugineum</em> in Caroline Co., Maryland (2/11/2022). (c) Wayne Longbottom, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 522104 - Psn: 186)

Acalitus ferrugineum in Caroline Co., Maryland (2/11/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC).

View Record Details Photo by Wayne Longbottom MBP List

Acalitus ferrugineum in Montgomery Co., Maryland (12/25/2021). (c) epic2112, some rights reserved (CC BY-NC).

View Record Details Photo by epic2112 via iNaturalist MBP List

<em>Acalitus ferrugineum</em> in Caroline Co., Maryland (2/21/2022). (c) Wayne Longbottom, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 527163 - Psn: 188)

Acalitus ferrugineum in Caroline Co., Maryland (2/21/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC).

View Record Details Photo by Wayne Longbottom MBP List

<em>Acalitus ferrugineum</em> in Caroline Co., Maryland (5/9/2022). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 681370 - Psn: 188)

Acalitus ferrugineum in Caroline Co., Maryland (5/9/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

<em>Acalitus ferrugineum</em> in Harford Co., Maryland (9/6/2023). (c) kidneymoth, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 883905 - Psn: 188)

Acalitus ferrugineum in Harford Co., Maryland (9/6/2023). (c) kidneymoth, some rights reserved (CC BY-NC).

View Record Details Photo by kidneymoth via iNaturalist MBP List

Acalitus ferrugineum in Montgomery Co., Maryland (12/25/2021). (c) epic2112, some rights reserved (CC BY-NC).

View Record Details Photo by epic2112 via iNaturalist MBP List

Acalitus ferrugineum in Harford Co., Maryland (9/6/2023). (c) kidneymoth, some rights reserved (CC BY-NC).

View Record Details Photo by kidneymoth via iNaturalist MBP List

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

Aceria ferruginea on American Beech leaves in Talbot Co., Maryland (7/14/2013). Media by Jim Brighton.

Aceria ferruginea in Queen Anne's Co., Maryland (5/16/2017). View Record Details Media by Jim Brighton.

Aceria ferruginea in Howard Co., Maryland (5/20/2017). View Record Details Media by Jim Brighton.

Acalitus ferrugineum in Talbot Co., Maryland (6/23/2016). View Record Details Media by Jim Brighton.

Acalitus ferrugineum leaf galls on American Beech in Cecil Co., Maryland (6/2/2021). View Record Details Media by Dave Webb.

Aceria ferruginea in Talbot Co., Maryland (5/16/2015). View Record Details Media by Jim Brighton.

Aceria ferruginea on American Beech in Queen Anne's Co., Maryland (6/24/2017). View Record Details Media by Bill Hubick.

Acalitus ferrugineum in Howard Co., Maryland (5/3/2019). Determined by Charley Eiseman/BugGuide. View Record Details Media by Sue Muller.

Acalitus ferrugineum in Queen Anne's Co., Maryland (5/1/2021). (c) Jim Brighton, some rights reserved (CC BY-NC). View Record Details Media by Jim Brighton.

Acalitus ferrugineum in Anne Arundel Co., Maryland (6/15/2018). (c) Mark Etheridge, some rights reserved (CC BY-NC). View Record Details Media by Mark Etheridge.

Acalitus ferrugineum in Kent Co., Maryland (6/29/2021). (c) Josh Emm, some rights reserved (CC BY-NC). View Record Details Media by Josh Emm.

Acalitus ferrugineum in Queen Anne's Co., Maryland (6/28/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Acalitus ferrugineum in Harford Co., Maryland (6/30/2021). (c) Josh Emm, some rights reserved (CC BY-NC). View Record Details Media by Josh Emm.

Acalitus ferrugineum in Montgomery Co., Maryland (12/25/2021). (c) epic2112, some rights reserved (CC BY-NC). View Record Details Media by epic2112 via iNaturalist.

Acalitus ferrugineum in Montgomery Co., Maryland (3/12/2023). (c) epic2112, some rights reserved (CC BY-NC). View Record Details Media by epic2112 via iNaturalist.

Acalitus ferrugineum in Caroline Co., Maryland (2/11/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC). View Record Details Media by Wayne Longbottom.

Acalitus ferrugineum in Montgomery Co., Maryland (12/25/2021). (c) epic2112, some rights reserved (CC BY-NC). View Record Details Media by epic2112 via iNaturalist.

Acalitus ferrugineum in Caroline Co., Maryland (2/21/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC). View Record Details Media by Wayne Longbottom.

Acalitus ferrugineum in Caroline Co., Maryland (5/9/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Acalitus ferrugineum in Harford Co., Maryland (9/6/2023). (c) kidneymoth, some rights reserved (CC BY-NC). View Record Details Media by kidneymoth via iNaturalist.

Acalitus ferrugineum in Montgomery Co., Maryland (12/25/2021). (c) epic2112, some rights reserved (CC BY-NC). View Record Details Media by epic2112 via iNaturalist.

Acalitus ferrugineum in Harford Co., Maryland (9/6/2023). (c) kidneymoth, some rights reserved (CC BY-NC). View Record Details Media by kidneymoth via iNaturalist.

Source: Wikipedia

Acalitus ferrugineum

Leaves of Fagus grandifolia exhibiting galls caused by the mite Acalitus ferrugineum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Family:	Eriophyidae
Genus:	Acalitus
Species:	A. ferrugineum
Binomial name
*Acalitus ferrugineum* Farlow & Hagen, 1885

Acalitus ferrugineum is a species of eriophyid mite.^[1] This microscopic organism induces erineum galls on the leaves of American beech, and is known from the United States and Canada.^[2]

Description of the gall

[edit]

Leaves affected by this species of mite will present with pale or light yellow erineum patches which progress into a reddish-brown later in the season. These galls are not known to have any consequences on the health of the tree beyond aesthetics.^[3]