Bug, not Blossom

Science

The elm sack gall aphid, Tetraneura ulmi, is a species of parasitic Aphid that lays eggs on the underside of elm leaves. After hatching, the newborn aphid larvae begin to feed, releasing chemicals that distort nearby plant tissue into elongated, bulbous pouches called galls. These galls often appear reddish-pink and reach 7-15 mm in length. Forming in early summer, the galls provide shelter for the growing nymphs and do not cause any lasting harm to the host tree. 

https://www.inaturalist.org/taxa/127163-Tetraneura-ulmi

Method

The artist took a photograph of these colourful galls whilst exploring near the Potomac River in Washington, D.C. Perplexed by the odd structures, she used species-identification tool ‘Seek’ to determine the cause. Much to her surprise, the pink eruptions were aphid galls! This art piece is a watercolour and ink interpretation of the photograph. 

Bio

Gabrielle Jawer is a science communicator, writer, podcaster and young professional from the suburbs of Washington, D.C., USA. With a love of myth, math, and mud, Gabrielle works to inform and inspire community members with accessible and engaging translations of technical research, especially in the context of environmental conservation and sustainability. In her free time, Gabrielle enjoys reading, baking and looking at big slugs. 

https://www.gabriellejawer.com/