Rainfall-free periods, preharvest intervals (PHI), and crop safety restrictions for postemergence herbicides
Herbicide |
Time before rainfall |
PHI (crop safety restriction) |
| 2,4-D and MCPA | 6 to 8 hr | Corn: 7 days (Overtop- 8; drop nozzles- before tasseling) Grain sorghum: (Overtop- 8; drop nozzles- 15) Rice: (Before internode exceeds 1/2) Wheat: (Before jointing) Wheat harvest aid: Hard dough |
| 2,4-DB | NI* | Soybeans: 60 days |
| Accent | 4 hr | Corn: 30 days (overtop- before 20/6 collars; drop nozzles-before 36/10 collars) |
| Achieve | 1 hr | Wheat: 60 days |
| Aim | 1 hr | Corn: (14 collars) Cotton: 7 days Grain sorghum: (6-leaf stage post; harvest aid: 3 days Rice: 60 days Soybeans: (V3-V10 post; harvest aid: 3 days) Wheat: (Jointing; harvest aid: 3 days) |
| Assure II | 1 hr | Cotton: 80 days Soybeans: 80 days |
| Atrazine | 1 to 2 hr | Corn: (12) Grain sorghum: (12) |
| Authority MTZ | NI* | Soybeans: 120 days |
| Banvel | 6 to 8 hr | Corn: (1 pt- 5; 1/2 pt- 36) Grain sorghum: (Overtop- 8; drop nozzles- 15) Wheat: (Before jointing) |
| Basagran | 8 hr*** | Corn: No Restrictions Rice: No Restrictions Soybeans: No restrictions |
| Basis | 4 hr | Corn: (4-leaf) |
| Beacon | 4 hr | Corn: 60 days (overtop- before 20; drop nozzles- before tassel emergence) |
| Bicep products | 1 to 2 hr | Corn: NA, (5) |
| Blazer | 6 hr | Rice: 50 days (Before boot stage) Soybeans: 50 days |
| Bronate | NI* | Wheat: NI* |
| Buctril | Corn: 30 days Sorghum: (Before boot stage) Cotton: 60 days Wheat: NI* |
|
| Buctril + Atrazine | 1 hr | Corn: NI* Grain sorghum: NI* |
| Callisto | 1 hr | Corn: 45 days (30 or 8-leaf) |
| Clarity | 4 hr | Corn: (1 pt- 5; 1/2 pt- 36) Grain sorghum: (Overtop- 8; drop nozzles- 15) Wheat: (Before jointing) |
| Classic | 1 hr | Soybeans: 45 days |
| Clincher | 2 hr | Rice: 60 days |
| Cobra | 30 min. | Cotton: 70 days Soybeans: 45 days |
| Concert | 1 hr | Soybeans: 60 days |
| Conclude Xact | 4 hr | Soybeans: 75 days |
| Distinct | 4 hr | Corn: 72 days (24) |
| Dual II Magnum | NA** | Corn: (5) |
| Exceed | 4 hr | Corn: 60 days (overtop- before 20, drop nozzles- before 30) |
| Extreme | NI* | Soybeans: 85 days (before bloom) |
| FirstRate | 2 hr | Soybeans: 65 days for grain, 14 days for forage (50% flowering) |
| Flexstar | 4 hr | Soybeans: (First bloom) |
| Frontrow | 2 hr | Soybeans: 70 days |
| Fultime | NA** | Corn: 60 days (11) |
| Fusilade | 1 hr | Cotton: 90 days Soybeans: (First bloom) |
| Fusion | 1 hr | Cotton: 90 days Soybeans: 1st bloom |
| Gramoxone Max | 30 min | Burndown: NA** Corn harvest aid: 7 days Soybean harvest aid: 14 days |
| Guardsman Max | 1-2 hours | Corn: 40 days (8) |
| Halex GT | NI* | Corn: 45 days |
| Harmony Extra | Several hours | Burndown: NA** Wheat: 45 days |
| Harmony GT XP/Unity | 1 hour | Soybeans: 60 days Wheat: Before flag leaf stage |
| Harness Xtra/ Degree Xtra | 1 to 2 hr | Corn: NA (11) |
| Harness/Degree | NA** | Corn: (11) |
| Hoelon | 1 hr | Wheat: 77 days |
| Hornet | 2 hr | Corn: 85 days (20) |
| Keystone/Breakfree ATZ | NA** | Corn: 60 days (11) |
| Laddok S-12 | 8 hr*** | Corn: 21 days (Fifth leaf) Grain sorghum: NI* |
| Lexar | 1 hr | Corn: 60 days (12) |
| Liberty | 4 hr | Corn: 70 days for grain, 60 days for forage (Overtop- 24 or 7 collars, drop nozzles- 36) |
| Liberty ATZ | 4 hr | Corn: 70 days for grain, 60 days for forage (12 corn) |
| Linex | NI* | Corn: NI* Grain sorghum: NI* Soybeans: 60 days |
| Lumax | 1 hr | Corn: 45 days (5) |
| NorthStar | 4 hr | Corn: 60 days for grain, 45 days for silage (Overtop- 20 or 4 collars, drop nozzles- 36) |
| Olympus | 4 hr | Wheat: 71 days |
| Olympus Flex | 4 hr | Wheat: 71 days |
| Osprey | 4 hr | Wheat hay, grain, and straw: 60 days; Wheat forage: 30 days |
| Outlook | NA** | Corn: 40 days (8) |
| Paramount | 6 hr | Grain sorghum: (12 inches) |
| Peak | 4 hr | Corn: 60 days (48 inches) Grain sorghum: 60 days (30 inches) Wheat: 60 days (Second node) |
| Permit | 4 hr | Corn: Forage/Silage- 30 days (grain- lay-by) Grain sorghum: Forage/Silage- 30 days (grain- lay-by) Rice: 28 days (Preflood application only) |
| Phoenix | 30 min. | Soybeans: 45 days |
| Pinnacle | 1 hr | Soybeans: 60 days Wheat: Before flag leaf stage |
| Poast/Poast Plus/Prestige | 1 hr | Corn: Grain- 60 days; Forage/Silage- 45 days Cotton: 40 days Soybeans: 75 days |
| Prefix | NA** | Soybeans: 90 days |
| Pursuit | 1 hr | Corn: 45 days Soybeans: 85 days (Before bloom) |
| Raptor | 1 hr | Soybeans: 85 days (Before bloom) |
| Ready Master ATZ | 2 hr | Corn: 50 days (12) |
| Reflex | 4 hr | Soybeans: (Before bloom) |
| Resource | 1 hr | Corn: Forage/Silage- 28 days; Grain- 60 days Soybeans: 60 days |
| Roundup | 2 hr (1 hour UltraMax) (30 min WeatherMax) |
Burndown: NA** Corn: 50 days (24 inches or 6 collars) Cotton: 7 days (Overtop- 4 leaf; directed- not specified) Soybeans: 14 days Harvest aid (Corn, Cotton, Grain sorghum, Small grain, Soybeans) : 7 days |
| Scepter | 2 hr | Soybeans: 90 days |
| Select/ Select Max | 1 hr | Cotton: 60 days Soybeans: 60 days (40 days for 4-oz red rice seedhead suppression label) |
| Sencor | NI* | Wheat: 21 days Corn: prior to tasseling |
| Shotgun | NI* | Corn: (Overtop- 4 leaf or 8, drop nozzles- 12) Grain sorghum: (Overtop- 4 leaf or 8, drop nozzles- 12) |
| Spirit | 4 hr | Corn: Forage/Silage 40 days; Grain- 60 days (Overtop- 20 or 6 collars, drop nozzles- 24) |
| Steadfast | 4 hr | Corn: 30 days (12inches or 6 collars) |
| Storm | 6 hr | Rice: 50 days (End of tillering) Soybeans: 50 days |
| Surestart | NI* | Corn: 85 days |
| Surpass/Breakfree | NA** | Corn: (11) |
| Synchrony XP | 1 hr | Soybeans: 60 days |
| Touchdown HiTech | RR Soybean: 14 days with no more than 20 fl oz/A RR Corn: 7 days with no more than 20 fl oz/A Conventional soybean: 7 days with no more than 3.6 Qts/a Conventional corn: 7 days |
|
| Touchdown Total | NI* | Corn and soybeans: 7 days |
| Tough | 1 to 2 hr | Corn: 68 days |
| Typhoon | 4 hr | Soybeans: (Before bloom) |
| Ultra Blazer | 4 hr | Rice: 50 days Soybeans: 50 days |
| Valor | 1 hr | |
| Valor XLT | 1 hr | No information on label |
| Yukon | 4 hr | Corn: 30 days (36) Grain sorghum: 30 days (Overtop- 8 drop nozzles 15) |
*No information on label.
**Not applicable
***Label now states that rainfall soon after application may decrease effectiveness.
