Moths of North Carolina
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199 NC Records

Dichomeris ligulella Hübner, 1818 - Palmerworm Moth

Dichomeris ligulellaDichomeris ligulellaDichomeris ligulellaDichomeris ligulella
Taxonomy
Superfamily:
Gelechioidea		 Family:
Gelechiidae		Subfamily:
Dichomeridinae		P3 Number:
59a0510		 MONA Number:
2281.00
Species Status: The common name 'palmerworm' apparently originated after a massive outbreak of this species in 1791 in New England (Slingerland (1901); Chapman and Lienk (1971). Palmer mean 'wanderer' and referred to pilgrims who visited the Holy Land and brought back a palm frond as proof of their journey.
Identification
Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012)Online Resources: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLDTechnical Description, Adults: Hodges (1986)Technical Description, Immature Stages: Chapman and Lienk (1971)                                                                                 
Adult Markings: Dichomeris ligulella is rather easily recognized by its color patterning, elongated and narrow wings, and labial palps with a prominent scale tuft and a slender, upright third segment that curves rearward and tapers to an acute apex. The adults have two color morphs that occur in both sexes. The first varies from rather uniformly light brown to light grayish, and has varying degrees of scattered darker flecking. The forewing of fresh specimens has four dark spots on the dorsal half of the wing that include a pair just before and beyond the middle. In the proximal pair the spot closest to the inner margin is slightly posterior to the other spot, while the reverse occurs for the distal pair beyond the middle. A row of dark spots is also present at the wing tip that begins in the subapical area and continues along the termen. The second color morph has a conspicuous dark brown to brownish-black longitudinal band that extends along the dorsal half from the wing base to the wing tip. The band tends to be somewhat jagged on the proximal half.
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: The larvae feed on a variety of hardwoods. The following life history account is mostly based on studies by Slingerland (1901) and Chapman and Lienk (1971) in New York where populations are univoltine. The adults overwinter and the females lay eggs singly on the host plants after the spring leaf-out. The larvae skeletonize leaf tissues and feed on developing fruits. They sometimes feed openly on leaves, but commonly form feeding shelters by either binding young leaves together at shoot tips, or rolling or folding portions of individual leaves. They will also occasionally feed on apple fruits and the galls of oaks (Chapman and Lienk, 1971). If disturbed, they often will drop from the leaves on silken threads where they remain suspended in the air, then return to feeding sites after a few hours. The larvae take around 4-8 weeks to reach the final instar, then pupate within folded leaves or other feeding sites. The adults emerge after about 10 days and remain in hiding places through the fall and winter months. Populations in most areas of the range appear to be univoltine.

The mature larvae are 10-15 mm long and have a pale yellowish-green abdomen with three darker olivaceous longitudinal stripes. One is mid-dorsal and relatively narrow, and the others wider and dorsolateral (Chapman and Lienk, 1971). The mid-dorsal stripe is sometimes fragmented, and all three stripes may fade posteriorly. The head is amber-colored and the prothoracic shield is dull green with darker coloration along the lateral and posterior margins that often produce two black U-shaped marks.
Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants.
Distribution in North Carolina
Distribution: Dichomeris ligulella is a common species that is found throughout most of the eastern US and adjoining areas on southern Canada (Saskatchewan eastward to Nova Scotia). Isolated records are also known from British Columbia and Wyoming. In the eastern US the range extends from Maine to southern Florida, and westward to central Texas, central Oklahoma, eastern Kansas, eastern Nebraska, Minnesota, and northeastern North Dakota. This species occurs statewide in North Carolina, from barrier islands to higher elevation slopes in the Blue Ridge.
County Map: Clicking on a county returns the records for the species in that county.
Dichomeris ligulella
Flight Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

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