If a plant sample is brought into your office for problem diagnosis, and the question cannot be answered in the county office, it is critical to provide campus specialists with appropriate information and an adequate sample so the best possible diagnosis can be made.
The appropriate form must be completely filled out and mailed with any samples submitted. Most of these forms have instructions for collecting samples on the back side of the form.
Here is a quick reference sheet for various questions about samples, organized by ISU department.
"What do I do with sick plant samples?"
Plant Disease Clinic
The clinic is a laboratory for diagnosing diseases of horticultural and field crops. Click on link above for detailed information about sample submission (insect or plant)
(515) 294-0581; 323 Bessey Hall
Extension Entomology identifies insects and insect damage.
(515) 294-1101; 109 Insectary Building
Use form IC-449, Insect Information Request Form
Extension Weed Science
Extension Weed Science answers questions relating to herbicide injury, herbicide use, and weed identification.
(515) 294-1923; 2104 Agronomy
Use form Ag-126, Weed ID and Herbicide Injury Diagnosis Form.
Submitting a Weed Sample
This hotline provides answers to home gardening questions. It is answered Monday - Friday, 10 a.m. - 12 noon and 1 - 4:30 p.m. (515) 294-3108
Extension Animal Ecology
This department provides information regarding injury to plants by animals.
(515) 294-7429; 103 Science II
Extension Soil Test Lab
For more information, call (515) 294-3076
Please do not hesitate to contact campus personnel if you have questions about sending samples. They will be glad to help you.