Northern & Central Midwest
Iowa State IPM
Wondering what pest attacked your tomatoes or roses this past summer? Iowa State University has created a great site (www.ent.iastate.edu/ipm/hortnews/) to help diagnose pest and disease problems and then solve the problem.
America's Garden Book
America's Garden Book, by James and Louise Bush-Brown (IDG Books Worldwide, 1996; $65), is not a new book, but it is one of the most useful general references I've found. It covers everything from garden design to plant selection to special habitats to indoor and greenhouse gardening. The best parts are the lists of all kinds of plants for all kinds of sites.