Sweet Corn Response and Weed Control to Saflufenacil plus Dimethenamid-P in Organic Soils

Abstract

There are limited PRE herbicide options available to provide residual weed control in sweet corn grown on organic soils in the Everglades Agricultural Area (EAA). Field studies were established to determine the efficacy of PRE applied saflufenacil + dimethenamid-P at six rates ranging from 10 + 88 to 319 + 2802 g ai ha−1 on weed control and sweet corn tolerance on organic soils in the EAA in 2011 and 2012. Saflufenacil + dimethenamid-P is a premix recently labeled for PRE weed control in field corn at 50 + 438 to 90 + 788 g ha−1 depending on soil texture. There was no phytotoxic effect of PRE applied saflufenacil + dimethenamid-P on sweet corn. At 42 d after treatment, common lambsquarters, common purslane, and spiny amaranth were controlled 90% with saflufenacil + dimethenamid-P at 58 + 508, 71 + 622, and 58 + 512 g ha−1, respectively. Sweet corn yield at 95% of the weed-free yield was estimated to be obtained at 69 + 606 g ha−1 of saflufenacil + dimethenamid-P. Our results show that saflufenacil + dimethenamid-P at 69 + 606 to 71 + 622 g ha−1 controlled three common weeds and maintained acceptable sweet corn yield. Labeled rates of saflufenacil + dimethenamid-P for field corn on mineral soils were adequate for weed control in sweet corn on organic soils.

Tank Mixing Pendimethalin with Pyroxasulfone and Chloroacetamide Herbicides Enhances In-Season Residual Weed Control in Corn

“…Saflufenacil is a protoporphyrinogen IX oxidaseinhibiting herbicide with POST and soil-residual activity (Grossman et al 2010), and dimethenamid-P is a chloroacetamide herbicide that acts as a seedling shoot growth inhibitor (Anonymous 2005). Saflufenacil þ dimethenamid-P applied PRE at low-use rates of 115 to 325 g ai ha À1 controls broadleaf weeds such as wild mustard (Sinapis arvensis L.) and Amaranthus species (Moran et al 2011;Odero et al 2014); however, rates as high as 933 g ha À1 (higher than the recommended rate of 735 g ha À1 in corn) are needed to improve residual control of certain broadleaf weeds such as common ragweed (Moran et al 2011).…”