Landscape Problem Solver
We all probably wish we had an experienced gardener we could call on for advice whenever problems arise in the garden. For those of us without such a fount of knowledge, the Landscape Problem Solver from the University of Maryland's Home Garden Information Center may be the next best thing.
This site offers photographic keys to help diagnose and solve plant problems, using integrated pest management principles. Choose from a list of broad categories, such as shade trees, vegetables, or houseplants. Then select the affected plant part from the drop-down menu. This brings up a photographic selection of symptoms. Choose the one that seems to fit and you get a page of information on the problem, its cause, and environmentally responsible ways to treat it. There is also information on how to look at a plant to best assess its symptoms, beneficial insects, and emerging pest threats.
The information has been put together with the Mid-Atlantic region as its focus, but there is lots of good information that will be of use to gardeners in other parts of the country.
To check out this great resource, go to Plant Diagnostics.