Biological control is increasingly used, even by home gardeners. It is a very good alternative to chemical treatments. To go further than the various pages on this site, here is a list of books on the subject (in French):
« Coccinelles, primevères, mésanges… la nature au service du jardin » Denis Pépin & Georges Chauvin / Editions Terre vivante
« Pucerons, mildiou, limaces… prévenir, identifier, soigner bio » Jean-Paul Thorez / Editions Terre vivante
Two books suitable for everyone, full of advice and offering an interesting range of organic solutions.
« Les maladies des plantes ornementales » and « Les animaux nuisibles aux plantes ornementales » Michel-André Tracol & Gérald Montagneux / Mat éditeur
Two great classics for learning all about the various growing problems plants can face.
« Connaitre et reconnaitre – la biologie des ravageurs des serres et de leurs ennemis naturels » Koppert France
A specialised, technical book with rich illustrations, but best suited to experienced readers.
And here is a list of a few websites to keep up with news in this field and to find suppliers: