The sample should include both healthy and infected plants. Completely dead grass is of no use since it will be filled with secondary organisms. Include the root system. Wrap the sample in newspaper or paper towels. Please don't place it in a plastic bag and don't add water.
Excess moisture can promote rapid deterioration and proliferation of secondary organisms.
Provide background information, such as when symptoms first appeared, turfgrass variety, pattern and distribution of the problem. Pictures of symptoms can be very helpful. Pack your wrapped sample tightly in a box to prevent dislodging the soil. Prepared by Barbara Ambruzs , extension program specialist, Department of Plant Pathology Iowa State University , Ames, Iowa. This information subject to a usage policy .