ABSTRACT
Field experiments were conducted at Clayton and Goldsboro, North Carolina in 1996 to evaluate weed management systems utilizing Roundup applied postemergence over-the-top of Roundup Ready Cotton (Gossypium hirsutum L.) compared to weed management with Staple and standard herbicide programs. Weed management systems consisted of the following herbicide combinations: Treflan applied preplant incorporated (PPI) at 1.0 pt pr/A with Cotoran preemergence (PRE) at 2.5 pt pr/A or followed by (fb) 1) Roundup early postemergence (EPOT) at 1.5 pt pr/A alone or fb Bladex at 2.0 pt pr/A plus MSMA at 2.4 pt pr/A mid post-direct (MPD), 2) Roundup EPOT fb Roundup MPD at 1.5 pt, 3) Roundup EPOT fb Roundup MPD fb Roundup late post-direct (LPD) at 1.5 pt, 4) Cotoran at 2.0 pt plus MSMA at 2.4 pt early post-direct (EPD) alone or fb Bladex at 2.0 pt plus MSMA at 2.4 pt MPD, 5) Staple at 1.2 oz pr/A EPOT alone or fb Bladex plus MSMA MPD. Additional treatments included Roundup EPOT alone or fb Bladex plus MSMA MPD, Roundup EPOT fb Roundup MPD alone or fb Roundup LPD. All POST treatments except Roundup were applied with a non-ionic surfactant at 0.25% (v/v). Cotton was planted on 38-inch rows and was not cultivated.
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