Management Clearfield Sunflowers

Clearfield sunflower, a non-GMO crop was released in 2003. The resistance gene in Clearfield sunflowers was transferred through traditional breeding techniques into commercial sunflowers from a wild population found in Eastern Kansas.

Clearfield sunflower may be treated with imazamox (BEYOND) at 4 oz. per acre to sunflowers in the 2 to 8 leaf stage. Addition of non-ionic surfactant and liquid nitrogen fertilizer additives are required for adequate weed control. If treated with BEYOND, conventional sunflower hybrids will be killed and Clearfield sunflowers may exhibit subtle chlorosis (slight yellowing of the leaves). BEYOND will control spring emerging susceptible grass species that have fewer than five leaves, including volunteer wheat (non-Clearfield), and broadleaf weeds before they exceed 3 inches (please consult label for grasses and broadleaf weeds controlled).

Populations of ALS resistant kochia, Russian thistle, and Palmer amaranth are known to exist and will not be controlled by BEYOND. Stewardship guidelines should be followed closely and labels should be followed directly to prevent the development of resistance in weeds. Timing of sprays and other recommendations made on the label will aid in effectiveness of BEYOND and help to maintain the effectiveness of the herbicide.

BEYOND is the only herbicide approved for use on Clearfield sunflowers.

Clearfield Sunflower: Beyond® Rate: 4.0 oz per acre. Only 1 application per season.

Required Herbicide Additives: Nonionic surfactant 1 qt / 100 gallons (0.25 % v/v) AND Nitrogen Based

Fertilizer 28%, 32%, 10-34-0:2.5 gal/100 gallons (2.5 % v/v), AMS: 12 - 15 lbs. / 100 gallons.

Application Method: Ground or Air: Apply in 10 - 20 gallons of water per acre with ground application and > 5 GPA by air. Spray pressure: 20 - 40 psi by ground. Use higher volume and pressure if dense weed pressure or heavy crop residue (no-till fields).

Always use flat fan or similar nozzles with ground applications.

Remember: Timing of sprays and other recommendations made on the label will aid in effectiveness of BEYOND and help to maintain the effectiveness of the herbicide.

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