[maxerickson]

Be sure to dig up the USDA source document and observe on page 3 that glyphosate is not applied to a majority of wheat acres:

http://www.nass.usda.gov/Surveys/Guide_to_NASS_Surveys/Chemi...

[harryjo]

glyphosate is on 45% of acres, so approximately half of the wheat you eat.

[maxerickson]

There are 3 types of wheat shown in the table, glyphosate is only applied to 45% of the acres for one of them (Durum).

Durum is only a small fraction of wheat grown in the US:

Durum wheat, accounting for 3-5 percent of total production

http://www.ers.usda.gov/topics/crops/wheat/background.aspx

So, no, it is not applied to nearly half of the wheat that is grown.

There's also not a whole lot of evidence that it is widely applied to the mature plants prior to harvest.

edit: This is poor phrasing: "only applied to 45% of the acres for one of them". The table does not claim to be comprehensive. So a better statement would say something like: the table only lists glyphosate being applied to 45% of one of the types.