Efficacy of Saflufenacil plus Dimethenamid-P for Weed Control in Corn

Abstract

A new, prepackaged mixture of saflufenacil + dimethenamid-P has been introduced for PRE control of grass and broadleaf weeds in corn. Field experiments with this new herbicide combination were conducted in 2008 and 2009 at four locations in southern Ontario, Canada. The objective of this study was to determine the dose of saflufenacil + dimethenamid-P required for overall weed control and species-specific weed control, as well as the dose required for early season weed control when followed with glyphosate at the six- to eight-leaf corn stage. Based on weed dry weight, the GR95 across locations ranged from 126 to 675 g ha−1. The 95% growth reduction (GR95) for common ragweed, common lambsquarters, pigweed, and wild mustard were 933, 325, 186, and 115 g ha−1, respectively. Highest corn yields were achieved with saflufenacil + dimethenamid-P applied alone at doses ranging from 368 to 1470 g ha−1. When followed by glyphosate, the dose range of saflufenacil + dimethenamid-P required to achieve the greatest corn yields was 46 to 1,470 g ha−1. A minimum dose of 184 g ha−1 of saflufenacil + dimethenamid-P followed by glyphosate was required for the yield to exceed that of the single treatment of glyphosate applied alone.

Occurrence and Management of PSII-Inhibitor-Resistant Chenopodium album L. in Atlantic Canadian Potato Production

“…In contrast, we found the addition of metribuzin (600 g ha −1 ) to sulfentrazone (105.12 g ha −1 ) improved control of common lambsquarters compared to sulfentrazone (105.12 g ha −1 ) alone. In addition, poor control of common lambsquarters has been previously reported with dimethenamid-P alone up to 1.12 kg ha −1 [21] and, control can be significantly improved with the addition of a tank-mix partner such as saflufenacil [22]. Our results support this assertion.…”

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

“…(Table 4). Also in a doseresponse experiment conducted by Moran et al (2011), a similar dose of 735 g ha À1 of saflufenacil þ dimethenamid-P premix applied PRE reduced growth of common lambsquarters by 90% 28 DAT; extended residual control was not evaluated. No benefit was gained at any evaluation time in either year by tank mixing pendimethalin with atrazine or saflufenacil þ dimethenamid-P premix.…”

“…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).…”

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

“…However, the relative difference of the ED 90 values among the curves was not significant even though a higher rate of saflufenacil þ dimethenamid-P was required to provide 90% control of common purslane. In contrast, on mineral soils with 3.0 to 6.7% organic matter Moran et al (2011b) estimated that saflufenacil þ dimethenamid-P need to be applied at 33 þ 392 and 19 þ 167 g ha À1 to provide 95% common lambsquarters and Amaranthus species control, respectively. Previous studies have shown that saflufenacil is extremely effective at controlling Amaranthus species.…”