Cotton

Other Pests You May See—Bloom to Boll Development

Each name links to more information on identification and management.

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Early instar larvae of saltmarsh caterpillar.
Saltmarsh caterpillar
Identification tip: Saltmarsh caterpillar larvae are hairy and gray when first hatched, then darken to yellow, brownish, or almost black with yellow lines. They are covered with reddish or black hairs, and can be up to 2 inches (50 mm) long when fully grown.

Say's stink bug nymph.
Stink bug nymph
Identification tip: A stink bug adult is shield-shaped with the posterior angles of the pronotum extended to prominent points. They are about 0.5 inch (12 mm) long, and more than half as wide as they are long. Color varies from green to dark brown. Nymphs may be nearly round and black or various colors in early instars.

Beet armyworm larva.
Beet armyworm
Identification tip: Beet armyworm larvae are 1 inch (25 mm) long when fully grown. They are dull green with wavy, light colored stripes running down the back and a broader pale stripe along each side. They usually have a dark spot on each side of the body above the second true leg.

Calocoris norvegicus nymph.
Cabbage looper
Identification tip: Cabbage looper larvae are greenish and crawl by arching their bodies. They are 1 to 1.5 inches (25-37 mm) long when mature.

Cotton bollworm (also called corn earworm and tomato fruitworm).
Cotton bollworm
Identification tip: Cotton bollworm larvae range from olive green to dark reddish brown in color and can be best distinguished from most other caterpillars (except the budworm) by the tiny spines, visible under a hand lens, that cover most of the body surface.
Western yellowstriped armyworm larva.
Western yellowstriped armyworm
Identification tip: Western yellowstriped armyworm larvae are dark-colored with a broad yellow stripe on each side.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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