Mating disruption for oriental fruit moth (Isomate-OFM TT)
Mating disruption dispensers for oriental fruit moth (OFM) should be hung in the upper portion of the tree canopy prior to moth emergence in the spring. Delayed applications will require the use of registered insecticides to manage the first generation. For best results, area-wide use of mating disruption products is encouraged.
Isomate OFM TT (fixed-point twin tubes) is a long-season product and there is no risk of the pheromone running out during the season of application. For well-managed orchards with a previous history of mating disruption, low population pressure and low economic damage from the targeted pests in the previous season, a minimum rate of 125 dispensers per hectare may be used. On the outermost border of the mating disruption area (outermost rows and trees at ends of rows) the rate should be doubled to the equivalent of 250 dispensers per hectare (100 dispensers per acre). For orchards under organic production or where significant injury was experienced in the previous season, apply 250 dispensers per hectare throughout the entire mating disruption area. Minimum block size is 4 ha. Research in Ontario demonstrated high rates of success in managing OFM using area-wide mating disruption.
If using mating disruption products for the first time, or in areas of high pest pressure, use an insecticide to manage the first generation of OFM. For late-harvest varieties located near untreated areas or host crops, application of insecticides may be required.
Monitor treated blocks with OFM pheromone traps to ensure moths are not being captured. Captured moths are a sign of some level of failure or weakness in the mating disruption program.
Routinely look for signs of damage from OFM. If unacceptable levels of damage have occurred, use insecticides until the source of the failure has been determined.
For more information, see OMAFRA Factsheet, Mating Disruption for Management of Oriental Fruit Moth in Stone and Pome Fruit.
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