You can help to reduce the number of larvae that hatch after winter by scrapping any loose bark away from trees; this will remove any cocoons that are hiding inside.
Likewise, clear leaf litter surrounding Pear and Apple to remove any hiding caterpillars.
Introduce nematodes to the soil to penetrate the soil and kill off any pest in its early stages.
You can buy sticky traps that will attract the adult moths, and they won't be able to get off.
Pheremone traps can also be purchased online. Not only can you monitor populations, but the traps specifically attract males. By capturing males, the female moths are less likely to reproduce successfully. Pheremone traps may trap small garden birds, so it's advised to use additional netting around traps to prevent this from happening.