Larvae of various Tortricid moths (Lepidoptera: Tortricidae) are well-known pests to fruit and nut growers, but less considered in vegetables. Here is a quick list of some economically important species in this group:
- Light Brown Apple Moth (Epiphyas postvittana)
- Fruittree Leafroller (Archips argyrospila)
- Codling Moth (Cydia pomonella)
- Filbertworm Moth (Cydia latiferreana)
- Strawberry Fruit Worm aka Omnivorous Leaftier (Cnephasia longana)
These small, bland colored moths are nearly undetectable in the landscape, but their larvae can cause billions of dollars of economic damage. Leaves are rolled or tied to provide shelter for developing larvae. Crop damage from this group can occur ‘from root to fruit’.
Quick Facts about Omnivorous Leaftier
- Outbreaks have occurred in Oregon, but are quite rare
- Small larvae mine leaves, then exit and use silk to tie leaves together
- Damage potential varies by crop – we will explain this further in a pest profile (in progress now).
- There is a GDD model available for western Oregon, and suggests that 1st generation larvae have completed feeding and will now be pupating. Moths of the 2nd generation are estimated to occur around June 11th.
- A field crop alert was issued May 22nd – see below
- ID guide and general info http://idtools.org/id/leps/tortai/index.html
- W. D. Edwards, Don C. Mote, Omnivorous Leaf Tier, Cnephasia Longana Haw.: A Relatively New Pest of Strawberries, Iris and Other Crops in Oregon, Journal of Economic Entomology, Volume 29, Issue 6, 1 December 1936, Pages 1118–1123, https://doi.org/10.1093/jee/29.6.1118
- “Microlepidoptera of Importance”, advanced taxonomic training video by Dr. Richard Brown, Mississippi State Univ. https://youtu.be/HkuIPZza5XU
- PNW Insect Management Handbook – Leafrollers as Landscape Pests