Indiana: Purdue Offers Herbicide Resistance Weed Screening – Video

    The Purdue Weed Science group is again offering herbicide resistance screening for Palmer amaranth, waterhemp, and giant ragweed for the 2016 growing season.  The resistance screens include glyphosate (group 9) and ALS-inhibitor (group 2) assays for giant ragweed, as well as glyphosate (group 9) and PPO-inhibitor (group 14) resistance screening for waterhemp and Palmer amaranth (pigweed).

    Leaf tissue samples can be submitted for molecular DNA analysis that will allow results to be generated within a few weeks of submission.  It is important to follow the directions on the submission form for collecting, storing, and shipping leaf tissue samples as this can have a large impact on the accuracy of the results.

    Seed samples can also be submitted for analysis of herbicide resistance.  This allows us to also screen for glyphosate resistance in giant ragweed.  It is also important to follow the directions on the submission form for seed collection from the appropriate number of plants to assure quality results.  The seed samples will take several months to return results as plants will need to be grown from seed in the greenhouse.

    The submission form with instructions for collection, storage, and shipping can be found here.  The submission form can also be found on the front page of the Purdue Weed science website.

    Please contact Julie Young (, 765-494-0891) with any questions or concerns you have when sampling or shipping a sample.

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