Three-generations

Guides

• Coptodisca juglandiella

  Walnut Shield-bearer

  Coptodisca juglandiella is a Nearctic leafminer moth in the family Heliozelidae, first described by Chambers in 1874. Native to North America, it was discovered in Hungary in 2019 as a new invasive species for Europe. The larvae feed internally on walnut leaves, creating distinctive blotch mines. Unlike its congener C. lucifluella, it has not undergone a host plant shift since introduction to Europe.

  leafminerinvasive-specieswalnut-pestHeliozelidaeNearctic-originEuropeHungaryJuglansthree-generationsno-host-shift