Tufted apple bud moth. Wing traps can be used to determine if this pest is below threshold densities, especially outside of the primary production areas. One trap placed near a known population can be used to determine a biofix. On the other hand, more than one trap may be needed to determine the actual density in a particular orchard block. Specific guidelines are given for several species in the Tree Fruit Production Guide.
Some trapping is better than none.
Trapping in a representative block over several years can provide valuable history on thresholds and trends over time. Penn State offers the Small-Scale Fruit Production Guide. This Guide is for growers with less than an acre and no pesticide license.