LIMITS ON LATE FOXTAIL HERBICIDE APPLICATION IN WHEAT

Wheat is rapidly growing and as well as weeds including green and yellow foxtail (pigeongrass). If herbicide application is still required for foxtail control in wheat, consider the following wheat and foxtail stage limits for post-emergence foxtail herbicides:

 

Wheat

Foxtail

Achieve

Up to boot

5-leaf

Cheyenne

End of tillering or 6-leaf (HRS only)

2-tiller (green only)

Dakota

End of tillering, or 6-leaf (HRS only)

2-tiller (green only)

Discover

Up to emergence of 4th tiller

5-leaf

Hoelon

Up to 4-leaf

4-leaf

Puma

6-leaf (prior to jointing)

2-tiller

Stampede

4-leaf (durum), 5-leaf (HRS)

3-leaf

Tiller

Up to 6-leaf (HRS only)

2-tiller

Refer to herbicide labels and NDSU Extension Service circular W-253 >2000 ND Weed Control Guide' for required information on herbicide use.

 

 

ASSERT FOR WILD MUSTARD CONTROL IN SUNFLOWER

With the exception of Roundup as a shielded-application, Assert is the only post-emergence herbicide currently available for broadleaf weed control in sunflower. Assert is registered through ND supplemental labeling at 0.6 to 0.8 pt/acre or 4.5 to 6 oz/acre WGD (about $7.50 to 10/acre) for POST control of wild mustard in the rosette stage and prior to bloom. In addition to excellent wild mustard control, small wild oat and wild buckwheat may also be suppressed with Assert. A non-ionic surfactant containing at least 80% active ingredient must be added to Assert at the rate of 0.25% v/v. Do not tank mix Assert with any insecticides or other herbicides.

 

Apply Assert to sunflower at the 2- to 8-leaf stage but before the crop is 15-inches tall. Severe sunflower injury may occur with high temperatures and humidity at application. Sunflower variety, growth stage, weather conditions, humidity, spray volume, spray additives, and type of application may affect sunflower safety. Risk of injury should be considered when deciding whether treatment is warranted. Do not apply to sunflower under drought or heat stress. Apply Assert only when air temperature plus relative humidity is below 150. Sunflower damage from misapplication may range from plant stunting to head deformation.

 

After Assert application, wait 4 to 5 days before between-row cultivation. Crop rotation restrictions exist.

 

Refer to the Assert label and NDSU Extension Service circular W-253 >2000 ND Weed Control Guide= for additional details.