GTI Diagnostic Clinic

The GTI Diagnostic Clinic

The GTI Diagnostic Clinic

The Guelph Turfgrass Institute's Diagnostic Clinic is an invaluable resource to Canadian turfgrass managers and strives to support sound management decisions based on the prinicples of integrated pest management.  Our team of diagnosticians will not only confirm whether the symptoms you are experiencing are biotic or abiotic in nature, they will also confirm the specific pathogen(s) present within the sample.  In most cases, recieved samples can be processed with a response to the client within 24-48 hours, however on rare occasions the process may take longer if further steps, such as incubation, are required.  When submitting a sample, be sure to read the form carefully and provide as much detail and background information as possible.  Pictures are also welcomed.  The more information you provide, the higher the likelihood of an accurate diagnosis.

Please keep in mind, the GTI Diagnostic Clinic is not a consulting agency.  Our services will offer closure and confirmation on your observed symptoms as well as a list of general management/remediation recommendations for any pathogens found present in the sample.  We highly suggest that you discuss results with your agronomic consultant to explore the specific steps and solutions required regarding your unique property and challenges.


GTI Diagnostic Clinic Hours

Monday-Thursday 9-4
Friday 9-1
All other times by appointment

Forms (PDF)



Q: Why should I use the GTI Diagnostic Clinic?

A: Although many turf managers have taken classes and sat in on presentations regarding specific disease ID and management strategies, it can be challenging to identify disease symptoms in the field with 100% accuracy.  The diagnostics clinic will help to confirm the specific pathogen present to ensure you are taking the most appropriate action for the problem at hand.  In many cases, when clients feel they have a disease, it is often an abiotic issue - meaning there is no pathogens causing the problem and rather the issue is related to environmental stresses such as drought, heat, traffic, shade, or poor management decisions.


Q: Why are there no longer any association discounts?

A: In the past, the GTI Diagnostic Clinic recieved subsidies and funding from industry associations in order to help sustain operations and provide reduced costs to those stakeholder groups.  The clinic no longer recieves any industry subsidies, or donations and therefore we are challenged to find a price point that is reasonable to clients but economically viable for the clinic.  If you are interested in supporting the clinic, or wish to further understand how the GTI Diagnostic Clinic operates, please be sure to contact the GTI Administrator by email at or by phone at 519 824 4120 ext. 52784.


Q: Why did I pay $120.00 to find out that I did not have a disease?

A: In our opinion this is money well spent.  Finding out your symptoms are not disease related can save money in labour and product applications.  It can often be troubling to discover that your biggest problem is not a disease, but rather your management style or the environmental conditions of the location in question.  We recieve many samples each year that confirm abiotic stress rather than the presence of pathogens.  Most often this is a result of over management (cutting to low, over watering, mismanaged fertility, poor cultural practices etc...) or challenging weather conditions.  Consider the results from the diagnostic clinic a helpful guide for you and your team to focus your efforts in areas that are directly related to the confirmed problem - rather than throwing darts (very expensive darts) at a dart board and hoping that one of these will solve the problem.


Q: I submitted a sample 10 days ago but have not been billed yet - What is the delay?

A: We process our billing on a bi-monthly basis.  The most you should ever wait before being charged and recieving your receipt via email is 15 days from the day we recieve the sample.  If you wish to expedite this process, please make a note on the form and we will do our best to process the charges ASAP.