Management of Volunteer Cotton with DuplosanTM

Duplosan^TM (dichlorprop-p) is a herbicide labeled for perennial weeds, woody plants and brush control which has recently received a 24(c) SLN in Texas for cotton stalk destruction as it is effective at controlling both XtendFlex^® and Enlist^® traited cotton.  Another potential use for this product is for management of volunteer cotton, either in the fall of the year following cotton harvest when being used for cotton stalk destruction or early spring prior to planting of a crop when the ground is fallow. 

 

Trials conducted in College Station, TX in 2019 evaluated Duplosan on Phytogen 480 W3FE cotton at rates of 16, 24, and 32 fl oz/acre alone or a rate of 16 fl oz/acre in combination with Clash (dicamba) at 8 fl oz/acre and Weedone LV4 EC (2,4-D) at 8.5 fl oz/acre or Panther SC (flumioxazin) at 2 fl oz/acre for control of volunteer cotton at 3 growth stages, cotyledon-2 true leaves (TL), 2-4 TL, and 5-6 TL stage alone or in combination with other products.  Within any given herbicide mixture or rate, control of volunteer cotton was greatest with applications made to younger cotton.  Within cotton growth stages, control was greater with higher rates of Duplosan. Also, the addition of Weedone^® LV4 EC and Clash or Panther SC to Duplosan improved control.