We moved into this house three years ago and have had two nice apple crops but this year the trees The trees have spots like this. Do you know what this is? How can we treat it? We prefer organic message as we've never buy fertilizer or treatment in our yard.
The tree have been affected by apple scab. Go to the following website to learn more about this very common disease:
Apple bagging is one way to reduce damage from scab and insects without applying chemical sprays.