They bore into fruit within 24 hours after hatching. First generation larvae require about 4 to 6 weeks to complete development and pupate. The average length of time for the overwintering generation to complete development and emerge as moths is 40 to 60 days. At least two generations of codling moth per year will occur in most regions. A third and even a partial fourth generation will occur in warmer areas.
Place traps soon after bud break in early spring.
In extremely hot areas rotate trap to north side of tree in hotter months. In back yard plantings place at least two traps. In commercial orchards of 50 acres or less use a minimum of two traps per block. In orchards larger than 50 acres, use an average of one trap per 10 acres provided conditions are uniform. Space traps evenly unless the orchard has areas differing in spacing, age, tree size or culture.