North Dakota Herbicide Resistant Weed Survey

Free Herbicide Resistant Weed Surveys Available for North Dakota Farmers


To combat herbicide resistant weeds, the North Dakota Soybean Council (NDSC) invites farmers and agronomists to participate in the North Dakota Herbicide Resistant Weed Survey by collecting and shipping pigweed and kochia leaves from multiple regions of North Dakota to the National Agricultural Genotyping Center (NAGC).


The survey’s goal is to combat herbicide resistant weeds by better understanding the genetics and distribution of resistant pigweeds and kochia to Group 2, 9 and 14 herbicides.


There are 250-300 Sample Collection Kits available for free herbicide resistance testing that will be conducted at the National Agriculture Genotyping Center. The Sample Collection Kits will be available at your local NDSU Extension offices around the state on a first-come, first-serve basis. This program is sponsored by the NDSC and the North Dakota Corn Utilization Council.


The Sample Collection Kit includes one prepaid U.S. Postal Service (USPS) envelope; one submission form; and four, small collection envelopes with blank labels.


Sample Collection Procedures:


  1. Locate late season (Fall 2023) or early season (Spring 2024) pigweeds that survived herbicide treatments. Properly identify the pigweed species prior to collecting the samples. The preferred pigweeds are Waterhemp and Palmer amaranth.


  1. If the fields contain multiple pigweed patches, collect leaves from one plant per patch.


  1. Collect two leaves near the top of the plant. Place two leaves from one plant in a small envelope. Do NOT mix leaves from multiple plants in the small envelopes.


  1. With a pen or marker, label the small envelope with a unique Sample ID. The Sample ID can be in the following format: Year-Month-County-Personal Field ID (Example: 23-09-Cass-SE2). Make sure to write the Sample ID number on the submission form (example below).


  1. Locate additional pigweed patches in the fields of your choice, and follow steps 1-4 to use all small envelopes in the collection kit.


  1. Place all small envelopes in the large, prepaid USPS envelope. Place the large envelope in your mailbox. Keep the samples dry and at room temperature before shipping via the USPS. The results will be emailed to the submitter.


  1. Optional: One kochia sample can be submitted with each kit. To submit a sample, collect two leaves from kochia that was suspected to have escaped herbicide treatment. Place the leaves in the small envelope labeled “kochia.” The kochia samples will be used to help develop tests for herbicide resistance at the NAGC. The kochia results will be shared at a later date.

Please direct any sampling questions to the:
Phone: 701-239-1451


For more helpful information about weeds from NDSU, CLICK HERE