Frass-ring
Guides
Phyllonorycter basistrigella
Phyllonorycter basistrigella is a minute leaf-mining moth in the family Gracillariidae. The species creates distinctive tentiform mines on the undersides of oak leaves, with larvae constructing an oval frass ring around the pupal cocoon. It is widely distributed across eastern and western North America, with records from Canada and numerous U.S. states. The wingspan measures approximately 8 mm.