HelLo!!
For all us permies, we're used to looking at what we can get from plants, even noxious ones. (scotch broom=nitrogen fixation, morning glory=LSD, etc!)
I'm just reading 'The
Apple Grower' by Michael Phillips. On p. 243 he says that a
water extract of Hedera Helix has been used to control
apple scab.
Score! Scab afflicts many apples here in Pierce County, and English Ivy is running rampant in nearby forests. Maybe we could not only take out the ivy, but someone could make money turning the ivy into anti-scab elixir!!