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NC State Extension

How to Submit a Turf Sample

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Please note that we do not process nematode samples. We suggest you submit those to the N.C. Department of Agriculture and Consumer Services Nematology Lab – NCDA Nematode Lab

For turfgrass weed identification and control recommendations, please contact our extension turfgrass weed management specialist, Dr. Fred Yelverton.


  1. Sample forms MUST BE filled out online using our database – PDIC Database. If you have submitted samples in the past, you should already have an account set up. Your username is your email address. There is an “Oops! I Forgot My Email Address or Password” option at login if needed.

    Sample Entry Tips –

    1. When entering contact information, keep these designations in mind –
      • Client = grower, golf course superintendent, homeowner, field manager, sod farmer, etc.
      • Agent = N.C. Cooperative Extension Agents
      • Consultant = landscaper, sales/company rep, agronomist consultant, etc.
      • Other = anyone else you want to add on the sample that will see the report
    2. Always check our database for your name, your sales rep’s name, etc. BEFORE creating another account for yourself or that person. All you need to do is type your/their name or part of your/their name in the entry field and it will auto populate if already in our system.

  2. We REQUIRE PHOTOS with all submissions and you can upload those with your entry in the database. You can also upload files such as spray records, soil test reports, nematode reports, etc. We will not process your samples until we have photos. This allows us to understand exactly what the symptoms are and increase our accuracy during the diagnostic process. Photos from standing height looking out across the turf are ideal. Up close photos or those looking straight down at the ground typically aren’t useful unless they clearly show something unique. Alternatively, you can email images directly to me at if needed. Keep image file size below 3MB each and send individually to be certain they make their way through to me.

  3. Samples should be completely wrapped in aluminum foil, double ziploc bagged (out-of-state only), and shipped overnight to the following address:

    NC State Turf Diagnostics Lab
    Attn: Lee Butler
    1575 Varsity Drive
    Module 6
    Raleigh, NC 27606
    (919) 513-3878

    Shipping Guidelines

    • Avoid using the United States Postal Service. Our clients have had too many issues with timely deliveries. FedEx, UPS, etc. have all done fine delivering on time.
    • Tracking numbers are useful to our lab when planning/coordinating our time in the lab. Please do not request a signature upon delivery as for this will likely result in delays. Tracking numbers should be emailed to Lee Butler at
    • NC County agents can use the same address above for courier deliveries.
    • If you would like to drop-off samples in person, please coordinate your drop with Lee Butler via email (

  4. Payment is expected ASAP following completion of our services using our online credit card payment system – Payment Site.


Have you …

1. Entered information online?
2. Uploaded photos?

(Failure to complete both items above WILL result in delayed service)

Please take the time to fill in as much information as possible to help ensure an accurate diagnosis. A video guide is provided below for proper sample collection. Fees are applied per problem. Please send at least 2, but no more than 4, samples per problem. If you would like to send multiple problems, then you will need to enter them separately in the database. If you are unsure, please contact us for assistance.

Problem Examples

  1. 2 samples of grass type A all showing the same symptom = 1 entry/fee
  2. 2 samples of grass type A and 2 samples of the same grass type with different symptoms = 2 entries/fees
  3. 2 samples of grass type A and 2 samples of grass type B, regardless of symptoms = 2 entries/fees

How to Collect and Submit Turfgrass Samples Video Guides