Canarsia ulmiarrosorella

The combination of small size, narrow grayish-brown forewings with subdued patterning, and prominent forward-projecting labial palps distinguishes this species from most similar pyralids. The specific association with elm foliage provides additional context. Similar Phycitinae in the genus Dioryctria and related taxa often show more contrasting wing patterns or different host associations.

Adults are small moths with wingspan approximately 15–20 mm. Forewings are narrow, elongated, and pale grayish-brown with faint darker markings. Hindwings are paler, almost translucent. Labial palps are prominent and project forward, giving the characteristic 'snout' appearance of Pyralidae. Larvae are greenish with darker dorsal stripes and a pale head.

Associated with deciduous forests and urban plantings where elm trees (Ulmus spp.) occur. Found in both natural woodland settings and cultivated landscapes.

Documented from eastern and central North America. Confirmed records include Massachusetts, Alabama, Oklahoma, and Vermont in the United States.

Adults have been recorded from May through August, with peak activity varying by latitude. Multiple generations may occur in southern portions of the range.

Larvae feed on foliage of elm trees (Ulmus spp.), tying leaves together with silk to form shelters. Specific elm species utilized have not been comprehensively documented.

• Ulmus - larval food plantelm species

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae construct leaf ties on elm foliage. Pupation occurs within the silk shelter or in leaf litter. Specific details of voltinism and overwintering stage require further documentation.

Larvae are solitary leaf-tiers, binding elm leaves with silk to create protected feeding chambers. Adults are nocturnal and attracted to light.

Herbivore specializing on elm foliage. Serves as prey for generalist insectivores including birds and parasitoid wasps. Population impacts on host trees appear minimal under normal conditions.

Occasional minor pest of ornamental elm trees. Not considered economically significant. May be encountered by arborists and naturalists monitoring elm health.

• Dioryctria spp.Similar size and general appearance in Phycitinae, but usually associated with conifers rather than broadleaf trees, and often show more distinct wing patterning.
• Pococera spp.Other leaf-tying pyralids, but typically associated with oak or other hardwoods rather than elm, and often have broader wings relative to body.

• leaf-tier
• elm specialist
• Pyralidae
• North America

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy