In article , Eyebright
writes

oh...any really anything people have found which encourages natural
preditors of pests or reduces likelyhood of disease..
for instance...never done this one but heard that hanging a bird feeder
in winter up in a climbing rose has the effect that the birds waiting
their turn to feed eat aphid eggs from the rose branches.

That's one example of many. We control aphids outside and inside by the
use of nettle infusion as described in the urg FAQ at:
http://www.nugget.demon.co.uk/MetaFAQ/nettle.html

We also regularly practice crop rotation for disease prevention plus
organic composting, mulching and green manuring to provide organic plant
nutrition. We never have need of manufactured fertilisers, pesticides,
herbicides or fungicides.

Other methods of pest and disease control are available online from the
Chase/HDRA Organic Gardening catalogue at:
www.OrganicCatalogue.com [2005 printed edition now available free]
--
Alan & Joan Gould - North Lincs.