We have an azalea (variety Corsage, we think) that is falling victim to a wilt. The first symptoms we noted a few months ago. In the last two weeks the plant has taken a nose dive and is pretty much gone. My wife has surfed the net reading extension service pages and has arrived at a tentative diagnosis of Phytophthora. The azalea was well established and its near neighbors are other azaleas. Also, we have at least three other azaleas of the same variety elsewhere in the garden. The first question is, what precautions should we take to prevent the disease from spreading? How aggressive should we be? We would prefer to avoid synthetic pesticides, but would use them as a last resort to protect the other plants. Last summer, about ten meters away in a separate bed, we had a Carolina Allspice die of a rapid, progressive wilt. What's the chance that the same culprit is to blame?