Table 8-9.  Pre-harvest intervals (PHI) for corn herbicides applied at burndown or postemergence.
	PHI (days)				PHI (days)
Herbicide	Silage	Grain		Herbicide	Silage	Grain
Accent	30	NI1		Gramoxone Extra4	NI	NI
Atrazine	21	NI		Laddok S-12	21	NI
Banvel	MS3	MS		Liberty5	60	70
Basagran	NI	NI		Liberty ATZ5	60	70
Basis	30	30		Lightning6	45	45
Basis Gold	30	NI		Lorox	NI	NI
Beacon	45	60		Marksman	MS	MS
Buctril	30	NI		Permit	30	NI
Buctril 4EC	30	NI		Pinnacle	30	30
Celebrity	MS	MS		Poast7	45	60
Celebrity Plus	32	72		Poast Plus7	45	60
Clarity	MS	MS		Resource	28	NI
2,4-D	7	NI		Roundup Ultra4	NI	NI
Distinct	32	72		Roundup Ultra8	508	7
Evik	30	30		Touchdown 54	90	90
Exceed	40	60		Tough	68	68
1 NI indicates no PHI specified on label.
2 Values followed by an asteric are suggested; no specific rainfree requirement on label.
3 MS indicates crop can be harvested after grain reaches milk stage.
4 Applied as a burndown prior to or at planting.
5 Apply only to Liberty Link hybrids
6 Apply only to Clearfield (imidazolinone-resistant) hybrids.
7 Apply only to Poast Protected hybrids.
8 Applied postemergence to Roundup Ready hybrids.  Do not cut for silage if Roundup Ultra is applied twice in-crop.