Desiccant
Drexel Defol (Sodium Chloride)
When to Apply
Backside of sunflower heads are yellow and bracts turning brown; seed moisture content below 35%.

Remarks
For use on confection and oil-type varieties. Thorough coverage of plant is essential. Apply aerially at five to 10 gpa, or at 20 to 30 gpa by ground sprayer.
 
Gramoxone Extra (Paraquat)
When to Apply
Backside of sunflower heads are yellow and bracts turning brown; seed moisture content below 35%.

Remarks
For use on confection and oil-type varieties. Apply with NIS. Randomly sample 10 average heads for seed moisture. Allow a seven day PHI.
 
Roundup (Glyphosate)
When to Apply
Apply when the backsides of sunflower heads are yellow and bracts are turning brown and seed moisture content is less than 35%.

Remarks
This is registered as a late season weed control but functions like a desiccant.
 
Sharpen (Kixor)
When to Apply
When sunflower seed moisture is 36 percent or less.

Remarks
For optimum desiccation an adjuvant must be used such as methylated seed oil or crop oil concentrate. Sharpen can be tank mixed with one or more labeled herbicides such as Glyphosate. Apply at least seven days prior to harvest. This is not a restricted use pesticide.
 
Valor® SX Herbicide
When to Apply
Apply when the backsides of sunflower heads are yellow and bracts are turning brown and seed moisture content is less than 35%.

Remarks
Valor can be used as a sunflower desiccant (2 - 3 oz/acre + MSO at 1 qt/a), and if used at 3 oz/acre it would provide residual weed control from the fall to early spring.

 
Directions for Use of These Products
It is a violation of Federal law to use any of these products in manner that is inconsistent with its labeling. For any requirements specific to your State or Tribe contact the State or Tribal agency that is responsible for pesticide regulation.
 
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