poplar leaf-base gall

(Pemphigus populicaulis)

Conservation Status
poplar leaf-base gall
  IUCN Red List

not listed

     
  NatureServe

not listed

     
  Minnesota

not listed

     
           
           
           
 
Description
 
 

Poplar leaf-base gall is a plant parasitic, gall making aphid. Like similar aphids, it is most often identified by the plant species on which the gall is found, by the location of the gall, and by the gall’s appearance.

In Minnesota this species is found on balsam poplar, Lombardy poplar, and plains cottonwood. A gall is formed by the tree in response to an aphid feeding on the petiole. The gall appears at the junction of the leaf stalk (petiole) and the leaf blade. It is light green, smooth, spherical, and ¼ to ½″ in diameter. There is a slit-like opening in the gall parallel to the direction of the petiole.

The adult female is long from the head to the wing tips. The antennae are thick and stout. The wings are transparent and colorless.

 
     
 

Size

 
 

 
     
 

Similar Species

 
  Poplar petiolegall aphid (Pemphigus populitransversus) forms a gall near the middle of a leaf petiole. The opening in the gall is a slanted, sideways (transverse) slit.  
     
 
Habitat
 
 

 

 
     
 
Biology
 
 

Season

 
 

 

 
     
 

Behavior

 
 

 

 
     
 

Life Cycle

 
 

Breeding takes place within the gall. Adults escape the gall through the slit-like opening.

 
     
 

Nymph Hosts

 
 

balsam poplar (Populus balsamifera)

Lombardy poplar (Populus nigra)

plains cottonwood (Populus deltoides ssp. molinifera)

 
     
 

Adult Food

 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7, 29, 30.

 
  8/26/2017      
         
 

Occurrence

 
 

Common and widespread; wherever its host species occur.

 
         
 
Taxonomy
 
 

Order

Hemiptera (true bugs, cicadas, hoppers, aphids and allies)  
 

Suborder

Sternorrhyncha (plant-parasitic hemipterans)  
 

Infraorder

Aphidomorpha (aphids and allies)  
 

Superfamily

Aphidoidea  
 

Family

Aphididae (aphids)  
 

Subfamily

Eriosomatinae  
 

Tribe

Pemphigini  
 

Genus

Pemphigus  
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

poplar leaf-base gall

 
       

 

 

 

 

 

 

Glossary

Petiole

The stalk of a leaf blade or compound leaf that attaches the leaf blade to the stem.

 

 

 

 

 

 
 
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