The loosestrife borer (Papaipema lysimachiae) is a moth of the family Noctuidae. It is found from New Brunswick to Georgia, west to Illinois, north to Wisconsin and Ontario.

Loosestrife Borer
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Noctuidae
Genus: Papaipema
Species:
P. lysimachiae
Binomial name
Papaipema lysimachiae
Bird, 1914
Synonyms
  • Papaipema purpurifascia Grote & Robinson, 1868

The wingspan is 28–35 mm. Adults are on wing from August to October.

The larvae bore the stems and roots of Lysimachia quadrifolia.

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