Louise wrote "I live in an area where everyone has at least one apple tree
in their yard
> and we're completely surrounded by orchard so I have no choice but to
spray
> if I want to harvest something."

Louise - In the States there is a government agricultural office in every
county and they are very good about providing information about spraying
schedules for apples as well as grapes and all other fruit and vegetables.
Perhaps there is a similar office in your area of Quebec. If not why not
spray what the commercial orchards spray?

Bill Frazier
Olathe, Kansas USA