Control of perennial weeds with sulfometuron plus imazapyr and hexazinone on old field plantings of loblolly pine

Gardiner, E.S.; Yeiser, J.L.; Atkins, R.L.J.; Clason, T.R.

Proceedings of the 44th Annual Meeting of the Southern Weed Science Society: 244-248

1991


Accession: 002059862

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Abstract
In order to assess control of perennial weeds, 7 tank mix treatments of sulfometuron + imazapyr or hexazinone + water were applied on two old field sites of loblolly pine (Pinus taeda) during 1990 in Arkansas and Louisiana. Control of perennial weeds, percent bare ground and pine seedling injury were evaluated 60 and 120 days after treatment (DAT). Goldenrod (Solidago sp.) and dogfennel (Eupatorium capillifolium) were easily controlled (> 70% control 120 DAT) by all treatments. Sulfometuron + imazapyr (2 + 4 oz/acre) and sulfometuron + hexazinone (2 + 32 oz) were the most consistent tank mixes for reduction of perennial weeds. Sulfometuron + imazapyr was the only treatment effective in reducing bermudagrass (Cynodon dactylon) (77% control 120 DAT). Tank mixes of sulfometuron + hexazinone were best for control of blue vervain (Verbena brasiliensis) (93% control 120 DAT). Sulfometuron + hexazinone (1 + 16 oz) was the least expensive ($14.08/acre herbicide cost) tank mix and was suited for old fields where Solidago sp. or E. capillifolium were primary competitors.