Response of Eight Sweet Corn (Zea mays L.) Hybrids to Topramezone

Abstract

<jats:p>Topramezone is a newly introduced herbicide for use in field corn (<jats:italic>Zea mays</jats:italic> L.) that may have potential for weed management in sweet corn. Tolerance of eight sweet corn hybrids to topramezone applied postemergence (POST) at 0, 50, 75, 100, 150, and 300 g a.i. ha<jats:sup>−</jats:sup> <jats:sup>1</jats:sup> were studied at one Ontario location in 2000 and two locations in 2001 and 2002. Topramezone applied POST at 50, 75, 100, and 150 g·ha<jats:sup>−</jats:sup> <jats:sup>1</jats:sup> did not cause any visual injury in Calico Belle, CNS 710, Delmonte 2038, FTF 222, FTF 246, GH 2684, Reveille, and Rival sweet corn hybrids at 7 days after treatment (DAT) and caused minimal injury (less than 5%) at 300 g·ha<jats:sup>−</jats:sup> <jats:sup>1</jats:sup> in all hybrids. The initial sensitivity observed in these hybrids was minimal and transient with no effect on visual injury at 14 and 28 DAT. Topramezone applied POST did not reduce plant height, cob size, or marketable yield of the sweet corn hybrids included in this study. Based on these results, topramezone applied POST at the rates evaluated can be safely applied to Calico Belle, CNS 710, Delmonte 2038, FTF 222, FTF 246, GH 2684, Reveille, and Rival sweet corn.</jats:p>

Tolerance of Eight Sweet Corn (Zea mays L.) Hybrids to Pyroxasulfone

“…However, none of the injury caused lasting damage and was not statistically significant. Visible injury did not increase significantly as herbicide rate increased and is consistent with previous studies on clopyralid (Soltani et al, 2005a) and topramezone (Soltani et al, 2007). This observation is in contrast to that observed when sensitive sweet corn hybrids were treated with bentazon (Diebold et al, 2004), isoxaflutole , mesotrione applied POST , nicosulfuron (Morton and Harvey, 1992;O'Sullivan et al, 2000), nicosulfuron plus rimsulfuron (O'Sullivan et al, 1995;O'Sullivan and Bouw, 1998), primisulfuron (O'Sullivan and Sikkema, 2002), prosulfuron (O'Sullivan and Sikkema, 2001), or thifensulfuron-methyl (Soltani et al, 2005b) in which injury increased with increasing herbicide rate.…”

“…Plant heights were similarly unaffected by increasing herbicide rate. These findings are similar to those found with applications of clopyralid (Soltani et al, 2005a) and topramezone (Soltani et al, 2007), but differ from other studies in which selected sweet corn hybrids were negatively affected by increasing herbicide application rates. As herbicide rate increased, plant heights of susceptible hybrids were increasingly reduced when bentazon (Diebold et al, 2004), nicosulfuron (O'Sullivan et al, 2000;Robinson et al, 1993), nicosulfuron plus rimsulfuron (O'Sullivan et al, 1995; Table 1.…”

“…(Table 4). Other herbicides such as clopyralid (Soltani et al, 2005a) and topramezone (Soltani et al, 2007) also caused no reduction to yield when the herbicide was applied at the label rate. These results are in contrast to other studies that have shown that susceptible varieties can be negatively affected by certain herbicides.…”

Research Article Genetic damage in Mexican and South American sweet corn varieties due to the herbicides nicosulfuron and topramezone

“…Topramezone is another of the herbicides used on corn crops. Soltani et al (2007), Bollman et al (2008) and Williams and Pataky (2010) reported tolerance to acute toxic effects (photobleaching) of topramezone on sweet corn hybrids, however the effect of the induced genetic damage was not evaluated. On our study with sweet corn, we observed high genetic sensitivity to topramezone in all concentrations (Figure 2).…”

The Mechanism of Methylated Seed Oil on Enhancing Biological Efficacy of Topramezone on Weeds

“…Topramezone, a hydroxyphenylpyruvate dioxygenase inhibitor, was commercially introduced in the year of 2006 [17]. When applied as a post-emergence herbicide, it controls a wide spectrum of annual grass and broadleaf weeds [18], [19], [20], [21] and is safe to corn ( Zea mays L.) [22], [23].…”