Yellow-necked Caterpillars

Blueberries November 14, 2011 Print Friendly and PDF

 

Yellow-necked caterpillar
Yellow-necked caterpillar.

 

Beginning in mid-summer, blueberry bushes should be inspected every two weeks. Clusters of older larvae are usually quite visible feeding on the terminal leaves. Since infestations tend to be localized and readily detected in the field, growers can prevent severe defoliation by pruning out branches with caterpillars.


Description: The larval stage is a colorful caterpillar that is moderately clothed with long, white hairs. The head is usually black, the neck is narrowly ringed with yellow or orange, and the body is conspicuously marked with longitudinal yellow lines against a black background. Fully grown larvae reach a length of about 5 cm (2 inches). When disturbed, these insects often elevate the anterior and posterior ends of their body, clinging to the substrate by only a few middle pairs of prolegs. Adults of these caterpillars are light brown moths with a wingspan of 4 cm to 5 cm (1.5 inches to 2 inches). The forewings are usually banded with dark brown lines, and the hind wings are somewhat lighter in color than the forewings. Adults are seldom seen because they are active at night.

Lifecycle: All of these species pass the winter as pupae in the soil. Adults emerge in early summer and lay their eggs in groups of 50 to 100 on the undersides of leaves. After hatching, young larvae often feed together on a single leaf for several days and then gradually disperse to nearby foliage where they continue to feed in loose aggregations. Larvae complete development in late summer, drop to the ground, and pupate under their host plants. There is only one generation per year.

 

Yellow-necked caterpillars
Yellow-necked caterpillars.

 

Damage: Although young larvae only skeletonize the blueberry foliage, older larvae are able to consume entire leaves and may completely defoliate small plants. Extensive feeding may retard growth, but plants are seldom killed because the injury occurs late in the growing season.

Management: Beginning in mid-summer, blueberry bushes should be inspected every two weeks. Clusters of older larvae are usually quite visible feeding on the terminal leaves. Because infestations tend to be localized and readily detected in the field, growers can prevent severe defoliation by manually removing the caterpillars, or by destroying the colonies with insecticide from a small, portable sprayer.

Reference:

Yellow-necked Caterpillars in Blueberry. North Carolina State University Cooperative Extension Service. July 2003. Retrieved 13 July 2010.

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.