European/Fruittree Leafroller
Archips rosanus (Linnaeus) / Archips argyrospila (Walker)

Life Cycle: Overwinter as eggs on host tree. Larvae present late March to early June. Moths present June-July laying overwintering egg masses. One generation per year.

Monitoring: Inspect branches for egg masses and monitor for egg hatch; from tight cluster on, inspect leaf and blossom clusters for larvae. They may be found in rolled leaves. Limb taps will indicate larval presence but not abundance.

Hosts: Fruit trees, locust, boxelder

Comments: Newly hatched and young larvae are usually yellow to dirty yellow in colour, gradually turning green as they mature. They all have a shiny brown or black head and segment behind the head. Larvae will wriggle backwards and drop from leaves on a silk thread when disturbed. They can be distinguished from two-generation leafrollers by their smaller size early in the spring.

Body length: Adult - 13.0mm; Mature larva - 16.0mm