Summer is heating up here in Louisiana and we’re starting to see quite a bit of southern blight, caused by the soilborne fungus Sclerotium rolfsii, on both tomatoes and peppers. Infected plants seem to collapse overnight and white fungal mycelium is usually observed at the base of the plant. It’s been so dry lately that the mycelium may not be readily visible, but as we get into wet, humid weather, it should become much more obvious. Currently, there are no fungicides that we recommend to control this disease this late in the season. For more information, see the fact sheet at http://tinyurl.com/682y4n2.
Donald M. Ferrin, Ph.D., Louisiana State University Agricultural Center, Baton Rouge, LA