Stale Seedbed Manipulation, Increased Rates of Flumioxazin, and Wick-Applied Herbicides for Palmer Amaranth Control in `Covington' Sweetpotato.

Abstract

The most common and troublesome weed in North Carolina sweetpotato is Palmer amaranth, an upright, branching, annual weed with competitive growth and reproductive characteristics.North Carolina sweetpotato growers have become increasingly interested in alternative Palmer amaranth management strategies that will provide season-long Palmer amaranth control and maximize sweetpotato storage root yield.Thus, field studies were conducted in 2012 and 2013 to 1) develop a Palmer amaranth management program with flumioxazin for stale seedbed sweetpotato, 2) determine the effect of increased rates of flumioxazin on foliar crop injury and storage root yield and quality, and 3) determine the effect of wick-applied paraquat and d-limonene on Palmer amaranth control and sweetpotato storage root yield and quality.Stale seedbed herbicide treatments consisted of flumioxazin at 72, 90, and 109 g ai ha -1 45 d before transplanting (DBP) alone or followed by (fb) flumioxazin at 72, 90, and 109 g ha -1 0 DBP, flumioxazin at 72, 90, and 109 g ha -1 0 DBP alone or fb S-metolachlor at 800 g ai ha -1 0, 5 to 7, or 10 d after planting (DAP), flumioxazin at 72, 90, and 109 g ha -1 plus clomazone at 630 g ai ha -1 45 DBP fb S-metolachlor at 800 g ha -1 10 DAP, or fomesafen at 280 g ai ha -1 45 DBP.Treatments consisting of flumioxazin 45 DBP fb flumioxazin 0 DBP or flumioxazin plus clomazone 45 DBP fb S-metolachlor 10 DAP provided the greatest Palmer amaranth control of 91 and 80% 109 DAP, respectively.Delayed flumioxazin Thank you to my family and friends for your unconditional love and support.Thank you to Drs.

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