Federal officials said there is "no evidence" the wheat -- genetically engineered to resist Monsanto's glyphosate herbicide -- has entered the field supply.
APHIS says it is collaborating with "state, industry and trading partners, and we are committed to providing all our partners with timely and transparent information about our findings."
U.S. wheat growers issued a statement confirming they are working with APHIS and noting that samples of the wheat plants were sent to USDA facilities in Missouri and Washington for testing and confirmation.