Eugnosta tenacia is a species of moth of the family Tortricidae. It is found in Brazil (Distrito Federal, Minas Gerais,, 2002: Systematic and faunistic data on Neotropical Cochylini (Lepidoptera: Tortricidae), with descriptions of new species. Part.1. Acta zool. cracov. 45: 287-316 Santa Catarina)., 2007, Acta Zoologica Cracoviensia 50B (2): 91-128
The larva have been recorded boring in tip of a shoot of B. cossinifolia.
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