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Module II: Economically Important Insect Pests. Lesson 2: Corn earworms. Corn earworm are about 0.75 inch long, rather robust, with a wing span of 1 to 1.5 inches, and adults range from olive green, to tan, to dark reddish brown in color .

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module ii economically important insect pests

Module II: Economically Important Insect Pests

Lesson 2: Corn earworms

Corn earworm are about 0.75 inch long, rather robust, with a wing span of 1 to 1.5 inches, and adults range from olive green, to tan, to dark reddish brown in color.

Egg laying occurs throughout the sweet corn growing season. The tiny, white eggs are laid singly on the foliage and fresh corn silk, which is the favorite site for egg deposition.

Eggs are spherical with 12 or more ridges radiating from the top.

Young larvae are greenish with black heads and conspicuous black hairs on the body.

Fully developed worms are about 1.5 inches long and pinkish to brown.

Corn earworms

module ii economically important insect pests1

Module II: Economically Important Insect Pests

Lesson 2: Corn earworms

Damages

Corn earworms infestations are common in New Mexico chili fields, but rarely are they of any economic concern. Fields planted adjacent to grain corn are more likely to have economic infestations.

Larvae cut the seedling plants in field

Corn earworms damages

module ii economically important insect pests2

Module II: Economically Important Insect Pests

Lesson 2: Corn earworms

MANAGEMENT

Corn earworm is primarily a problem in sweet corn where treatments should be timed to coincide with egg hatch.

Biological ControlMany predators and parasites attack corn earworm eggs, including several species of Trichogramma

Cultural ControlIn Chili pepper, very early plantings require fewer treatments than late-season pepper because earworm population densities increase as the season progresses.