Handy Bt Trait Table for U.S. corn production updated for 2017

Corn growers can use the 2017 BT Trait Table to keep track of Bt corn traits, efficacy and refuge requirements.

March 2017 Update: The Handy Bt Trait Table updated for 2017 was tweaked to include the new QRome trait package and to update herbicide tolerance for Agrisure EZ refuge products. The 5 percent refuges in these products are transitioning to glyphosate-tolerant (GT) plus Liberty-link (LL) hybrids to match the Bt portion of the seed blend. However, this isn’t the case for all hybrids just yet! Some refuge hybrids are still only glyphosate-tolerant. If you are planting EZ refuge this season, be sure to check the code on the bag tag to determine if you can use Liberty/glufosinate overtop the field.

It’s a new year, time for a new Handy Bt Trait Table updated for 2017. This year brings a major change to the bulletin. After the frequent damage to Cry1F-traited hybrids by western bean cutworm during summer 2016, I worked with two colleagues to add a new column to the table. This column provides information on the insect x Bt combinations with documented field failures, resistance or cross-resistance.

The Handy Bt Trait Table updated for 2017 is posted on Michigan State University’s Field Crops Entomology website. I also posted a list of the citations for reduced effectiveness we used to create the new column.  

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