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HCS Weed Database

College of Food, Agricultural, and Environmental Sciences



Active ingredients: 
mesotrione, S-metolachlor
Site of action groups: 
27, 15
EPA reg number: 
Restricted use product or combination: 
Rate (per A): 

2 qts/A - less than 3% soil OM; 2.4 qts/A - 3% or greater soil OM. Rate can be reduced to 1.6 qt/A when applied early postemergence with glyphosate (glyphosate-resistant corn) or glufosinate (LibertyLink corn).

Application timing: 

Can be applied preemergence to most types of corn, including popcorn (yellow only), sweet corn, and corn grown for seed. Can be applied postemergence to field corn and seed corn only, until corn reaches the 8-leaf stage or is 30 inches tall.


For postemergence applications, add either NIS (0.25% v/v) or COC (1% v/v). AMS or UAN can be added but this increases the risk of crop injury. Do not apply with MSO or use UAN as the spray carrier.

Rotation intervals: 

Time to wait to plant following application (months; NR = no restrictions): corn - NR; wheat - 4.5; oats - 4.5; alfalfa - 18; clover - 18; soybeans - 9; tomatoes - 18; popcorn - NR; sweet corn - NR