The oriental fruit moth is pest of peaches and apples in Kentucky. This can have six generations from spring
through fall. Larvae of feed on fruit, when available, but will also attack succulent terminal growth causing twig dieback.
Identification and Biology
The oriental fruit moth is a 1/4 inch (6 to 7mm), charcoal-colored, nondescript moth. Fine alternating bands of light
and dark lines on the wings give it a mottled appearance. The larva is similar to codling moth, pinkish with a brown head
and 1/2 inch long.
The adult Oriental fruit moth is about half the size of codling moth.
Control of Oriental fruit moth in commercial orchards relies on regular scouting of the trees and fruit, pheromone trapping,
and the use of weather monitoring and degree day models. Traps should be monitored twice a week early in the season and on a weekly
basis starting in mid May.
Pheromone trapping uses chemical lures to attract male moths. A trap consists of plastic top and bottom held together by
a wire hanger with the lure placed inside (1C or 1CP trap). Traps are hung in the southeast part of the tree at eye level, usually
1 for each 10 acres (minimum of 2/orchard) in commercial orchards. Traps should be hung pre-bloom with lures replaced monthly.
Degree Day Accumulation
Initial trap catch in the early spring is termed the biofix. The biofix for Oreintal fruit moth is the date of
the first sustained flight of moths. After the biofix, degree days are calculated daily and compared with the target
values in the following table.
Degree day targets for the various Oriental fruit moth insecticides
DD target for application
Throughout the growing season in commercial orchards, trap catches that exceed an average
of 7 moths per trap per week trigger an insecticide application once the the number of degree
days have been reached for the chosen insecticide.