Leafroller Caterpillar

Pest: Leafroller caterpillar (includes many different species such as Archips argyrospila, Partotis sp., Choristoneura rosaceana, Argyrotaenia citrana)

Pest Type: Insect Pest

Major Identifying Features: Young larvae are light green caterpillars with black heads and are first seen at bud break, mature larvae are about 1 inch long and have a green body and black head (fruit tree leafroller)

Life Cycle: Leafrollers overwinter in the egg stage in irregular masses of 30-100 eggs covered with a cemented secretion, there is one generation per season

Pest Rating: Minor to moderate

Management Rating: Easy to moderate

Host/Season/Outbreak Information: Appear in spring on leaf buds

Damage Information: Leafrollers feed on leaves and blossoms, flower buds and fruits during bloom, once the tree/plant has leaved out, larvae tie up leaves and live within leafrolls, feeding on leaves/fruits

Management Options: Biological control with natural enemies such as lacewing and lady beetle larvae, and parasites, applications of Bacillus thuringiensis

Sources:

http://www.ipm.ucanr.edu

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