- Before applying any disease-controlling chemicals, collect turfgrass from the edge of the affected area. The sample should include both healthy and infected plants. Completely dead grass is of no use since secondary organisms quickly colonize it.
- Take a sample of at least 6" diameter (a cup cutter works well). Include the underlying soil and root system.
- Wrap the sample in newspaper or paper towels. Please do not place it in a plastic bag and do not add water. Excess moisture can cause rapid deterioration of the sample and proliferation of secondary organisms.
- Provide background information, such as when symptom first appeared, turfgrass variety, and pattern and distribution of the problem. Pictures of symptoms can be very helpful.
- Fill out a "Plant Disease Identification Form" (PD-31) and include it with the sample. If you need forms you can conctact:
Your county or area extension office or
ISU Extension Distribution Center
119 Printing and Publications
Iowa State University
Ames, IA 50011
(515) 294-5247
- Pack your wrapped sample tightly in a box to prevent dislodging the soil. Ship the package early in the week via overnight delivery to:
327 Bessey Hall
Iowa State University
Ames, IA 50011
(515) 294-0581