Codling Moth Activity in the Wenatchee Valley as Shown by Trap Records

Abstract

Bait traps have served as efficient indicators of codling moth activity in the apple orchards of the Northwest. Trap records taken from various sections of the Wenatchee valley show that there is a marked similarity in moth activity in all parts regardless of temperature conditions. Such factors as soil type, cultural practices, cover crops and exposures are of relative unimportance in determining the time when the moths become active and deposit eggs in the orchards. Moth activity is approximately the same in widely separated locations and under totally different conditions.