poplar leaf-base gall

(Pemphigus populicaulis)

               
Conservation Status

IUCN Red List

not yet assessed poplar leaf-base gall

NatureServe

not listed

Occurrence

Common and widespread; wherever its host species occur.

Flight/Season

 

Hosts

balsam poplar (Populus balsamifera)

Lombardy poplar (Populus nigra)

plains cottonwood (Populus deltoides ssp. molinifera)

Size


Identification

This 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. 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.

 
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.


Larval Food

 

 
Adult Food

 

 
Life Cycle

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

 
Behavior

The gall is formed by the tree in response to an aphid feeding on the petiole.


Distribution Distribution Map  

Sources: 7, 29, 30.


Comments

 


Taxonomy

Order:

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

 

No Rank:

Sternorrhyncha

 

No Rank:

Aphidiformes

 

No Rank:

Aphidomorpha (aphids)

 

No Rank:

Aphidomorpha (aphids)

 

Superfamily:

Aphidoidea

 

Family:

Aphididae (aphids)

 

Subfamily:

Eriosomatinae

 

Tribe:

Pemphigini

 
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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