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Crop oil concentrates (COC) contain either a vegetable or petroleum based oil and 15 to 20% emulsifier. The emulsifier allows the oil to mix uniformly with the water used as a carrier. The type of oil used and the amount of emulsifier in the COC influence the performance of these products. Methylated seed oils (MSO) contain a vegetable oil that has been chemically altered – these products may enhance weed control with certain herbicides under appropriate conditions. Research has shown that there may be little advantage to MSO’s over COC under ideal conditions, but that MSO’s may improve weed control in situations with large weeds or weeds that are under drought stress. COC are typically used at rates of 1 to 2 pt per acre.