They used to be pretty clean in that sense... Of course i cannot speak for the whole thousands of farms that there are out there in the mountains! until recenlty they were pretty much stickin to traditional agricultural methods...(manure,they have access to natural phosphates) Never seens someone sprayn nothing...
But recently things start to change..ive seen some greenhouse poppin around....lots of new genetics from holland, spain...i bet that new pests are been introduced too and so prolly also some farmer start spray...
If you dont know the farmer i guess...its kind of complicate...get it tested!