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News about Monsanto
In its testing, the EWG tested 45 samples of conventionally grown oats.
Bayer's $66 billion acquisition closed just months ago.
Monsanto Co. was socked with $289 million in damages in the first trial over claims that its Roundup weed killer causes cancer.
The weed killer has been blamed for a former gardener's non-Hodgkin lymphoma.
The move will go into effect just before the market opens on Thursday.