Oak Leaf Gall Midge

Fascinating facts about the Oak Leaf Gall Midge

• the larvae spin circular galls only 3 to 4 mm across. These thick-walled, reddish-brown bumps sit on the upper surface of red oak leaves, snug between the veins, and can be either flat or convex.
• You'll only meet Polystepha pilulae in eastern North America, where its host red oaks grow. Its range is limited to that region.
• Polystepha pilulae sits deep in the insect family tree: Kingdom Animalia, Phylum Arthropoda, Class Insecta, Order Diptera, Family Cecidomyiidae, Genus Polystepha. Being a gall-midge places it among the tiny flies that manipulate plant tissue.
• In city parks, native oaks become bustling hotels for gall-midges, while long-planted non-native trees host almost none. The study found This shows planting native oaks can revive hidden arthropod diversity in urban landscapes.

At a glance

About the Oak Leaf Gall Midge

In the dappled light of the forest floor, the Oak Leaf Gall Midge dances through the underbrush, its delicate wings beating at a hypnotic pace as it searches for the perfect oak leaf to call home. With a life cycle intricately tied to the whims of its host plant, this tiny insect weaves a remarkable narrative of symbiosis and adaptation, its presence a subtle yet vital thread in the intricate tapestry of the ecosystem. As it flits from leaf to leaf, the Oak Leaf Gall Midge leaves behind a trail of tiny, rounded galls - a testament to its remarkable ability to manipulate the very fabric of its surroundings.

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