elm bead gall mite

(Aceria campestricola)

Conservation Status
elm bead gall mite
  IUCN Red List

not listed

     
  NatureServe

not listed

     
  Minnesota

not listed

     
           
           
           
 
Description
 
 

Aceria is a genus of tiny mites. They are so small that they are almost impossible to see with the naked eye. Unless a scanning electron microscope is available, a morphological description of an adult individual is useless. However, many mites can be easily identified by the shape of the galls they produce and the plant species on which they are found.

Elm bead gall mite is a specialized plant feeder. It is found exclusively on American elm. It produces small, variable, globular, yellowish-green, bead-like galls on the upper surface of the leaves. The galls are solitary – they do not coalesce into larger galls. They occur singly between secondary veins. They have a rough surface and may be covered with hairs.

 
     
 

Size

 
 

Tiny, almost microscopic

 
     
 

Similar Species

 
     
     
 
Habitat and Hosts
 
 

American elm (Ulmus americana)

 
     
 
Biology
 
 

Season

 
 

 

 
     
 

Life Cycle

 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7, 29, 30.

 
  6/18/2021      
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
  Class Arachnida (arachnids)  
  Subclass Acari (mites and ticks)  
  Superorder Acariformes (mites)  
 

Order

Trombidiformes  
 

Suborder

Prostigmata (prostigs)  
  Infraorder Eupodina  
 

Superfamily

Eriophyoidea  
 

Family

Eriophyidae (gall and rust mites)  
 

Subfamily

Eriophyinae  
 

Tribe

Aceriini  
 

Genus

Aceria  
       
 

Synonyms

 
 

Aceria brevipunctata

Eriophyes campestricola

Eriophyes ulmi

Phytoptus ulmi

 
       
 

Common Names

 
 

elm bead gall mite

 
       

 

 

 

 

 

 

 

 

 
 
Visitor Photos
 
           
 

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MinnesotaSeasons.com Photos
 
    elm bead gall mite   elm bead gall mite  
           
    elm bead gall mite      
           

 

Camera

     
 
Slideshows
 
 
     
     
     

 

slideshow

       
 
Visitor Videos
 
       
 

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Other Videos
 
     
     
     
       

 

Camcorder

 
 
Visitor Sightings
 
           
 

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MinnesotaSeasons.com Sightings
 
   

 

 

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Created: 6/18/2021

Last Updated:

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