Moths of North Carolina
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Crambus Members:
225 NC Records

Crambus agitatellus Clemens, 1860 - Double-banded Grass-veneer Moth

Taxonomy
Superfamily: Pyraloidea Family: CrambidaeSubfamily: CrambinaeTribe: CrambiniP3 Number: 800950.00 MONA Number: 5362.00
Comments: The genus Crambus includes around 155 species that are distributed globally. Some of the species are significant pests that can cause damage to agricultural crops, lawns and rangelands. This is one of 41 species in this genus that occur in North America north of Mexico (Pohl and Nanz, 2023), and one of fifteen species that occur in North Carolina.
Identification
Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012)Online Photographs: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLD                                                                                 
Adult Markings: In this species the head and thorax are brownish-yellow. The palps when viewed from the side are mostly light fuscous with white beneath (Fernald, 1896). The forelegs are light fuscous, and the ground color of the forewing varies from brownish-yellow or brownish-orange to brown. The most conspicuous mark is a broad, silvery white, longitudinal stripe that gradually widens as it extends from the wing base to near the middle of the wing, then tapers to a sharp point at around two-thirds the wing length. A small tooth often project from the dorsal edge at the point where the stripe begins to taper, and the margins are lined with yellowish- to brownish-orange scales. The stripe is divided by a faint brownish-yellow to brown line that is usually incomplete and sometimes missing on worn specimens. When present, it extends from the distal end of the band basally and typically fades out near the middle of the wing. A V-shaped brownish-yellow to brown subterminal line is present at around four-fifths that is double, or nearly so, with the distal line often incomplete or broken on the dorsal half. The space between the lines is filled with silvery and blackish scales, with the blackish scales most prevalent on the costal half. In between the subterminal line and the end of the silver stripe there is a separate large white patch. The patch is bordered above and below with two silvery lines with black edges that alternate with brownish-yellow lines. The subapical area beyond the subterminal line has an outwardly oblique brownish-yellow line that extends to the outer margin. It is followed by a small triangular brownish-yellow patch and a similar white patch that adjoins the black terminal line that covers the apical third of the outer margin. The remainder of the outer margin has a series of four or five black dots or dashes. The fringe is silvery lead gray, while the hindwing is gray to grayish-white with a paler fringe. North Carolina populations have two common color forms, with the first having the ground color and lines light brownish yellow to yellowish-orange, and the second with the ground and lines brown to dark brown.

Crambus saltuellus is very similar but has a more prominent brown or brownish-yellow line running through the silver stripe, and has a larger number of dark and silver lines extending out from the upper portion of the silver band. In some individuals, dark streaks run close to the inner margin from the base of the wing to the subterminal line (BugGuide, 2018). In addition, the subterminal line is margined by a line of silvery white scales on the distal side that is relatively obscure in C. agitatellus.
Wingspan: 17-22 mm (Covell, 1984); 20-25 (Ainslie, 1924).
Adult Structural Features: Ainslie (1924) has a description of the male genitalia.
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: Local populations are typically univoltine and feed on grasses, including wheat, but detailed studies of the larval life history are lacking. Bragg (2005) reported that C. agitatellus and Agriphila vulgivagellus were the primary pests that caused the loss of around 40% of a wheat crop in Washington. The larvae overwinter and begin feeding again with the spring warm-up, followed by pupation.
Distribution in North Carolina
Distribution: Crambus agitatellus is found in the eastern U.S. and in adjoining areas of southern Canada (Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island). In the U.S. the range extends from Maine to Florida, and westward to eastern Texas, central Oklahoma, eastern Kansas, eastern Nebraska, Minnesota and northeastern North Dakota. This common species occurs in every state east of the Great Plains, and is found statewide in North Carolina.
County Map: Clicking on a county returns the records for the species in that county.
Flight Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

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