No Common Name Aceria caulis (Cook, 1904)    Synonyms: Eriophyes caulis.
Kingdom Animalia   >   Phylum Arthropoda   >   Class Arachnida   >   Order Trombidiformes   >   Family Eriophyidae   >   Genus Aceria   

Description:

“The Petiole Gall of Black Walnut, caused by the Eriophyid mite, Aceria caulis, is an interesting and beautiful gall that passes through several color changes as it matures. The galls start as enlarged greenish to white galls on the petiole and main leaf rib. They are covered with a mass of erineum-like hairs that give the galls a felted appearance. As they mature, they become pink and crimson to reddish brown. Large petiole galls grow to cover most of the leaf and stem, causing leaflets to fail to develop, and affected leaflets to be distorted and twisted. No control is generally necessary for Walnut Petiole Gall. The galls may be handpicked and destroyed if there are only a few and can be reached” (Sherrie Smith, 2015).

Relationships:

Galls form on Black Walnut leaves.

There are 14 records in the project database.

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Aceria caulis in Montgomery Co., Maryland (7/13/2021). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Aceria caulis in Montgomery Co., Maryland (7/13/2021). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

An Aceria caulis gall twisting a Black Walnut stem in Carroll Co., Maryland (8/1/2020). Photo by Barbara Speckart. (MBP list)

A petiole gall caused by Aceria caulis on a Black Walnut leaf in Baltimore City, Maryland (6/13/2011). Determined by Charley Eiseman/BugGuide. Photo by Thomas Wilson. (MBP list)

Aceria caulis in Montgomery Co., Maryland (6/15/2021). (c) jonkk, some rights reserved (CC BY-NC). Photo by jonkk via iNaturalist. (MBP list)

Aceria caulis in Frederick Co., Maryland (7/2/2020). (c) Bernadette Roche, some rights reserved (CC BY-NC). Photo by ecodoc via iNaturalist. (MBP list)

Aceria caulis in Frederick Co., Maryland (7/2/2020). (c) Bernadette Roche, some rights reserved (CC BY-NC). Photo by ecodoc via iNaturalist. (MBP list)

Aceria caulis in Frederick Co., Maryland (6/15/2019). Photo by Sue Muller. (MBP list)

An Aceria caulis gall on black walnut in Howard Co., Maryland (6/27/2018). Determined by Charley Eiseman/BugGuide. Photo by Sue Muller. (MBP list)

Aceria caulis in Baltimore Co., Maryland (6/27/2021). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Aceria caulis in Montgomery Co., Maryland (9/7/2019). (c) Jane Hartman, all rights reserved. Photo by Jane Hartman. (MBP list)

Aceria caulis in Montgomery Co., Maryland (6/27/2021). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Aceria caulis in Montgomery Co., Maryland (9/7/2019). (c) Jane Hartman, all rights reserved. Photo by Jane Hartman. (MBP list)

Aceria caulis in Montgomery Co., Maryland (9/7/2019). (c) Jane Hartman, all rights reserved. Photo by Jane Hartman. (MBP list)

Aceria caulis in Montgomery Co., Maryland (6/27/2021). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Aceria caulis in Montgomery Co., Maryland (6/27/2021). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Aceria caulis in Montgomery Co., Maryland (7/10/2021). (c) Emily Summerbell, some rights reserved (CC BY). Photo by Emily Summerbell, Ph.D. via iNaturalist. (MBP list)

Aceria caulis in Montgomery Co., Maryland (7/10/2021). (c) Emily Summerbell, some rights reserved (CC BY). Photo by Emily Summerbell, Ph.D. via iNaturalist. (MBP list)

Aceria caulis in Montgomery Co., Maryland (7/10/2021). (c) Emily Summerbell, some rights reserved (CC BY). Photo by Emily Summerbell, Ph.D. via iNaturalist. (MBP list)

Aceria caulis in Frederick Co., Maryland (7/2/2017). Photo by Mark Etheridge. (MBP list)

Aceria caulis in Montgomery Co., Maryland (7/10/2021). (c) Emily Summerbell, some rights reserved (CC BY). Photo by Emily Summerbell, Ph.D. via iNaturalist. (MBP list)


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