I only just saw your reply. Here’s a (fairly old) report that discusses organic farming in the UK, including management of disease, that may be useful—though note it was sponsored by a organic-promoting organisation, but it does include criticism and doesn’t just seem to be a piece of marketing: http://charliepyesmith.com/wp-content/uploads/2003/01/Batteries-not-included.pdf . I don’t know of any other thorough reports—it would be useful if there were more.
I only just saw your reply. Here’s a (fairly old) report that discusses organic farming in the UK, including management of disease, that may be useful—though note it was sponsored by a organic-promoting organisation, but it does include criticism and doesn’t just seem to be a piece of marketing: http://charliepyesmith.com/wp-content/uploads/2003/01/Batteries-not-included.pdf . I don’t know of any other thorough reports—it would be useful if there were more.