Egg traps were used to study populations of the navel orangeworm, Paramyelois transitella (Walker) in almond orchards in the San Joaquin Valley of California in 1974 and 1975. Seasonal variations in moth emergence and flight as indicated by egg laying patterns were readily identified in both years. Egg deposition curves closely followed ♂ moth flight patterns during the early season but did not correlate as well from midsummer through fall. Differences in moth and egg populations could be detected with egg traps in orchards that received varying levels of post-harvest sanitation. Sticky traps baited with the egg trap attractant showed a sex ratio of responding navel orangeworm moths of ca. 11 ♀:1 ♂. Attractant odors given off by the egg trap bait are not specific for navel orangeworm but also attract the raisin moth, Cadra figulilella (Gregson). However, only eggs of navel orangeworm were found on the egg traps in the field.