Species Details

Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum Read more about this collection »

Common NameGreater Sod Webworm SeasonalityJuly to September. IdentificationA large crambid (23-33 mm wingspan). Forewings varying from brown to pale ochreous, lighter in the lower half, surface sprinkled with dark brown scales; with dark lines from the base through the cell and a dark area closer to the margin; with an oblique line from the cell to the apex; terminal line with 4-5 dark dots; fringes steel gray cut by four or five white lines. Hind wings light brown to pale grayish white, fringe whitish. Distinguished from the other Pediasia species by the combination of dark areas in the forewing and the lighter fringe which is cut by white lines. Worn specimens can be hard to identify. The male genitalia are illustrated in Landry (1995). Pediasia aridella edmontella also has white streaks in the fringe and outer margin of the forewing but it lacks the pronounced dark lines.

Scientific Name Pediasia trisecta Common Name Greater Sod Webworm Habitat Grassland areas. Seasonality July to September. Identification
A large crambid (23-33 mm wingspan). Forewings varying from brown to pale ochreous, lighter in the lower half, surface sprinkled with dark brown scales; with dark lines from the base through the cell and a dark area…
A large crambid (23-33 mm wingspan). Forewings varying from brown to pale ochreous, lighter in the lower half, surface sprinkled with dark brown scales; with dark lines from the base through the cell and a dark area closer to the margin; with an oblique line from the cell to the apex; terminal line with 4-5 dark dots; fringes steel gray cut by four or five white lines. Hind wings light brown to pale grayish white, fringe whitish. Distinguished from the other Pediasia species by the combination of dark areas in the forewing and the lighter fringe which is cut by white lines. Worn specimens can be hard to identify. The male genitalia are illustrated in Landry (1995). Pediasia aridella edmontella also has white streaks in the fringe and outer margin of the forewing but it lacks the pronounced dark lines.
Life History The early stages have been described by Felt (1894) and Ainslie (1927). May be two brooded. It can cause economic damage to lawns. Conservation Of no concern. Diet Info No local information, but said to be grass by Fernald (1896). Range A North American species that is widespread across southern Canada and in the northern part half of the United States. In Alberta, it occurs throughout the prairies and the aspen parkland.
Photo by Charlie Bird
Photo by Charlie Bird

Citation

Page Citation for Pediasia trisecta

Page Citation

"Species Details - Pediasia trisecta, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-2921. Accessed 02 Mar. 2024.

Authorship

Name Bird, C. D.
Role species page author
Date 2003-04

References

Specimen Information

There are 237 specimens of this Species.

237 results plotted on map in 65 markers.
Note: Only records with latitude and longitude coordinates are plotted on map.

UASM39208 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Calgary Collected BySalt, George Date Collected1920-09-04

UASM39209 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Calgary Collected BySalt, George Date Collected1920-09-04

UASM39192 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1922-07-18

UASM39193 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1922-08-10

UASM39194 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1924-08-17

UASM39195 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1924-08-17

UASM39196 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1924-08-28

UASM39197 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1924-08-31

UASM39198 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1924-08-31

UASM39199 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1924-09-07

UASM39200 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1924-09-07

UASM39201 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1950-08-25

UASM39202 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Edmonton Collected ByBowman, K. Date Collected1950-09-02

UASM39204 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, High River Collected ByBowman, K. Date Collected1921-08-25

UASM39205 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, High River Collected ByBowman, K. Date Collected1921-08-25

UASM39203 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Hillcrest Collected ByBowman, K. Date Collected1934-08-28

UASM39206 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Lethbridge Collected ByStrickland, E. H. Date Collected1925-07-27

UASM39207 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Medicine Hat Collected ByBowman, K. Date Collected1943-08-05

BIRD100 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Nevis Collected ByBird, C. D. Date Collected2002-08-22

BIRD101 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Nevis Collected ByBird, C. D. Date Collected2002-09-03

BIRD102 - Pediasia trisecta

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: Alberta, Nevis Collected ByBird, C. D. Date Collected2002-09-03

Adult Seasonal Distribution