Tomato Late Blight Information
Several universities have excellent websites with detailed information about the late blight, aka, tomato blight. Cornell University's Tomato Late Blight includes many helpful photos showing symptoms of tomato blight as well as information on management techniques and a forecast model. The University of Massachusetts at Amherst also has extensive information at Late Blight Alert for Tomato and Potato.
Clever Gardening Technique
Use Old Pruning Saw to Cut Roots
When digging holes to plant shrubs and perennials, we often encounter thick roots. Sometimes it's easy to work around them. Other times, we must cut the root to make way for the new plant's root ball. Use an old pruning saw with a sterilized blade to cut roots as cleanly as possible; clip a jagged end with old pruners. However convenient, do not use your best bypass pruners. The soil will damage the blades.