Pemphigus populitransversus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hemiptera
Suborder: Sternorrhyncha
Family: Aphididae
Subfamily: Eriosomatinae
Genus: Pemphigus
Species:
P. populitransversus
Binomial name
Pemphigus populitransversus
(Riley, 1879)

Pemphigus populitransversus also known as poplar petiole gall aphid or cabbage root aphid, induces galls on the leaves of poplar trees.

Description

Insect

Adults are 1.6-2.6 mm in length. They lack cornicles on the abdomen and have relatively short antennae and legs compared to other aphid species.

Gall

Galls are induced by female Pemphigus populitransversus on the base of leaves in black cottonwood, narrowleaf cottonwood, fremont cottonwood, and aspen trees. The female P. populitransversus then lays her eggs inside of it. These galls are green or red, fleshy, smooth, and up to 14 mm in diameter. A slit allows the aphids to exit the gall.[1]

Galls on a poplar tree

Alternate hosts are in the Brassica family. In these, galls form in the roots.[2][1]

References

  1. 1 2 Russo, Ronald A. (2021). Plant galls of the Western United States. Princeton, New Jersey: Princeton University Press. pp. 143–145. ISBN 0-691-21340-2. OCLC 1239984577.
  2. "Poplar Petiole Gall Aphid". Province of Manitoba Agriculture and Resource Development. Retrieved 2021-07-02.
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