Last summer, due to the very wet year we experienced, many plants suffered from a fungal disease called Botrytis blight. Worst affected were tomatoes and lilies.
As the breeder of the 'University of Saskatchewan' lily, I was more than dismayed to discover that it, like many other lilies, is quite susceptible to this disease. It is imperative that steps be taken to lessen the re-occurrence of botrytis by using copper sulfate as a soil drench where the spores exist. After that, spraying the plants with a fungicide is important also. This disease isn't fatal unless left untreated for a number of years.