FUTURE WEED CONTROL SYSTEMS FOR CONSERVATION TILLAGE COTTON IN THE SOUTHEASTERN USA
Mar 10, 2017

Agronomy & physiology WCRC Agro-Physio-north-america WCRC1
Abstract                                                                         Back to Table of contents

Bromoxynil used with transgenic cotton and pyrithiobac provided early season postemergence control of annual morningglory, Ipomoea spp., prickly sida, Sida spinosa, velvetleaf, Abutilon theophrasti, and common cocklebur, Xanthium strumarium without adversely affecting cotton.  Neither bromoxynil nor pyrithiobac controlled sicklepod, Cassia obtusifolia, postemergence.  Fluometuron alone or in combination with pyrithiobac provided preemergence sicklepod control.  Thiazopyr applied preemergence provided large crabgrass, Digitaria sanguinalis, control without significant crop injury.  High-residue cultivators allowed the use of banded preemergence herbicides in conservation tillage cotton, thus reducing herbicide usage.  Pyrithiobac soil-applied or early postemergence, bromoxynil applied postemergence with transgenic cotton, and the use of high-residue cultivators show potential for use in future weed control systems for conservation tillage cotton in the Southeastern USA, government regulations permitting.

Conclusions

Bromoxynil and pyrithiobac provided postemergence broadleaf weed control without cotton injury for conventional and conservation tillage cotton.  Neither product controlled sicklepod postemergence; therefore, a soil-residual herbicide having sicklepod activity will be required in cotton fields infested with this species.  Pyrithiobac has soil activity on sicklepod and may be used in combination with fluometuron for PRE treatments.  Thiazopyr showed potential for preemergence annual grass control in notill cotton on sandy loam soils without the cotton injury exhibited by metolachlor.  High-residue cultivators are available which allow the use of banded herbicide applications in conservation tillage cotton thus reducing chemical use in these systems.

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