Peach twig borer mating disruption works best in large, contiguous areas of orchard (minimum 5 to 10 acre blocks). Mating disruption dispensers should be placed in the orchard before biofix (around shuck split). Mating disruption dispensers should be placed in the orchard according to manufacturer recommendations.  Ideally, a biofix (first moth flight) for each orchard should be determined by hanging a pheromone trap in a nearby, non-mating disrupted site at petal fall, and checking it daily until moths are caught two nights in a row.  The biofix date is used to determine the timing for supplemental sprays.  It is impossible to get an accurate biofix within an orchard that has been historically using mating disruption due to the low moth population.

Monitor peach twig borer using large plastic delta traps with a sticky liner and lure.  There are no specialized high load lures; only standard lures are available.  Traps should be used according to the following guidelines:

• hang traps at petal fall
• hang in upper third of tree canopy
• one trap/10 acres (minimum 2 traps per orchard), plus traps in hot spots
• check traps once/week, and count and remove moths, or keep a running tally for each generation or since the last insecticide spray

Characteristics of Common Mating Disruption Dispensers

Brand	Type	Rate	Cost (approx)	Effectiveness	Notes
Checkmate PT-XL	hand-applied clips	200/acre	$70/acre	effective	dispensers last 90 days; where summers are longer/hotter than normal, dispensers will run out of pheromone before the season’s end, requiring a spray before hanging or after dispensers run out
Isomate-PTB TT	hand-applied loops	200/acre	$100/acre	somewhat effective	trap catch may be higher, but USU research shows that injury level is no different between the PTB brancs

Lure types for monitoring pests in mating disrupted orchards

Lure Name	Longevity	Threshold to Apply Supplemental Spray	Notes
1x	30 or 60 Days	none has been determined, consider treating after a cumulative capture of 6 moths	because it is not a high load lure, these traps should not catch any moths in a successful MD orchard