[moberley]

Glyphosate is sometimes used a pre-harvest dessicant with cereal crops like wheat in which case the Roundup Ready gene is not required.

[1letterunixname]

The Wikipedia datalinks opines it's a practice banned in Austria and frowned upon by buyers in Canada.

Spraying chemicals on crops to make them cheaper to harvest is enough evidence to convince me it's best to avoid all cereal products unless they're organic.