Sod Webworms in Turf

Description

The moths are 12 to 34 inch long. They have a prominent snout. The forewings are brown or dull ash gray with a whitish streak from the base to the margin; the hind wings are brownish. When at rest, the moths fold their wings closely. The tiny, oblong eggs are white to pale yellow. Most sod webworms vary from pinkish to yellowish to light brown. They become 58 to 1 inch long with thick bodies, coarse hairs, and spots on each segment. The head is yellowish brown to black. Individual caterpillars often assume a C-shape. The reddish-brown pupae are oblong and 38 to 12 inch long.

Chemical Control

Recommendations for insecticides approved for control of these insects in home lawns can be found under sod webworms in the North Carolina Agricultural Chemicals Manual.

Recommendations for insecticides approved for use on sod farms, golf courses or other commercial sites can also be found in the North Carolina Agricultural Chemicals Manual.

Insecticide and Formulation

Amount per 1,000 sq ft

Precaution and Remarks

acephate* (Lesco-Fate, Orthene T, T&O) (Precise 4G) 0.5 to 1 oz 2.8 lb Home lawns only. Irrigate immediately.
azadirachtin* (Azatrol, Neemix, Turplex) 0.5 fl oz
Bacillus thuringiensis, various brands 1 to 2 lb/acre
bifenthrin* (Menace, Talstar, others) F, GC; G form also available 0.18 to 0.25 fl oz Use GC formulation for golf courses.
carbaryl* (Sevin) 80 WSP 2.5 to 3 oz
chlorantraniliprole (Acelepryn) 0.046 to 0.092 fl oz
chlorpyrifos* (Dursban) 4 E, 2 E, 5 G, Pro See label For use on golf courses; check new label.

clothianidin (Arena)

.5G

50 WDG

14 to 22 oz

0.15 to 0.22 oz

chlothianidin + bifenthrin (Aloft) See label
cyfluthrin* (Tempo 2, Tempo Ultra) 0.143 fl oz Irrigate immediately after application. Do not apply to newly seeded stands or bentgrass.
deltamethrin (Deltagard) G 2 to 3 lb
halofenozide (Mach 2) 2 SC 1.5 G 1.5 fl oz 1 lb Can be used two times per season at these rates.
imidacloprid + bifenthrin (Allectus, Atera) See label Rate varies with pest. Different formulations for different sites.
indoxacarb (Provaunt) SC 0.0625 to 0.25 fl oz Not labeled for use on sod farms.
lambda-cyhalothrin* (Cyonara, Scimitar, Battle) See label Do not make applications within 20 feet of any body of water. No reentry until spray has dried.
permethrin* (Astro) 0.4 to 0.8 fl oz
spinosad A and D (Conserve) SC 0.25 to 1.25 fl oz Rate varies with size and species.
trichlorfon* (Dylox, Proxol) 80 SP 1.5 to 3 oz
dinotefuran (Zylam) 20SG 1 oz per 1000 ft2

Written By

Photo of Rick Brandenburg, N.C. Cooperative ExtensionDr. Rick BrandenburgExtension Specialist (Peanuts & Turf) & Department Extension Leader (919) 515-8876 rick_brandenburg@ncsu.eduEntomology & Plant Pathology - NC State University
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This Extension factsheet can also be viewed at:
https://content.ces.ncsu.edu/sod-webworm-in-turf