5/1/2018

Weeds to Watch

AMAZON SPRANGLETOP

Resistance: Amazon sprangletop resistance to ACCase inhibitors has been documented in Louisiana rice.

Recommendation: Control options for Amazon sprangletop include Clincher® herbicide at a rate of 10 ounces per acre applied early postemergence or RebelEX® herbicide at a rate of 18 fluid ounces per acre at pre-flood. RebelEX provides both postemergence control and residual activity.

 

BARNYARDGRASS

Resistance: There is widespread documentation of barnyardgrass resistance to multiple herbicide modes of action, including PSII inhibitor (propanil), synthetic auxins (fenoxaprop and quinclorac), ACCase inhibitors, DOXP inhibitors (clomazone), ALS inhibitors and cellulose inhibitors (quinclorac).

Recommendation: Pre-flood options include Loyant® herbicide at a rate of 1 pint per acre or RebelEX® herbicide at a rate of 18 fluid ounces per acre. Additionally, Grasp® SC herbicide at a rate of 2 fluid ounces per acre applied early postemergence will control barnyardgrass.

 

HEMP SESBANIA

Resistance: No documented resistance.

Recommendation: A pre-flood application of Loyant® herbicide at a rate of 1 pint per acre is recommended.

 

 

 

 

RED RICE

Resistance: ALS resistance was first documented in Arkansas in 2002.

Recommendation: Utilizing NEWPATH herbicide in the CLEARFIELD® Production System is best for achieving red rice control.

 

 

 

RICE FLATSEDGE

Resistance: Resistance to ALS inhibitors has been documented in the rice-growing states of Arkansas and Louisiana.

Recommendation: A pre-flood application of either Loyant® herbicide at a rate of 1 pint per acre, RebelEX® herbicide at a rate of 18 fluid ounces per acre or Grasp® SC herbicide at a rate of 2 ounces per acre applied early postemergence will provide control.

 

YELLOW NUTSEDGE

Resistance: Resistance to ALS inhibitors was documented in Arkansas in 2013.

Recommendation: A pre-flood application of either Loyant® herbicide at a rate of 1 pint per acre, RebelEX® herbicide at a rate of 18 fluid ounces per acre or Grasp® SC herbicide at a rate of 2 ounces per acre applied early postemergence will provide control.