Authority Assist

Active ingredients: 
sulfentrazone, imazethapyr
Site of action groups: 
14, 2
Manufacturer: 
FMC
EPA reg number: 
279-3330
Restricted use product or combination: 
No
Rate (per A): 

Application rates when used in standard PRE or PRE + POST programs, on soils with 2 to 4% OM: coarse-textured - 8 to 10 oz; medium-textured - 10 to 12 oz; fine-textured - 12 oz. Application rate when followed by a POST applica-tion of glyphosate in Roundup Ready soybeans, on soils with 2 to 4% OM: coarse-textured - 4 to 5 oz; medium-textured - 5 to 6 oz; fine-textured - 6 oz. Within a rate range, use higher rates where soil pH is less than 7, and lower rates where soil pH is greater than 7.

Application timing: 

Apply preplant or preemergence, up to 3 days after soybean planting. To minimize risk of crop injury, apply a week or more prior to planting. When applied after planting, apply prior to soybean seed germination to prevent injury to emerging soybean seedlings.

Comments: 

Do not use on coarse soils with less than 1% organic matter, or to soils with pH greater than 7.5. Do not incorporate deeper than 2 inches.

Rotation intervals: 

Time to wait to plant following application (months; NR = no restrictions): corn - 10; wheat - 4; oats - 18; alfalfa - 12; clover - 40; soybeans - NR; tomatoes - 40; popcorn - 18; sweet corn - 18.