Sweet Corn (Zea mays) Cultivar Sensitivity to Mesotrione^*

Abstract

Field studies were conducted in 1999 and 2000 at Simcoe, Ridgetown, and Exeter, Ontario, to evaluate the tolerance of nine sweet corn cultivars to mesotrione, applied preemergence (PRE) at 140 and 280 g ai/ha and postemergence (POST) at 100 and 200 g ai/ha. Urea ammonium nitrate fertilizer (28%) at 2.5% (v/v) and crop oil concentrate at 1% (v/v) were added to POST applications of mesotrione only. All cultivars were tolerant to mesotrione applied PRE. There was no injury, or reductions in plant height or yield with PRE applications of mesotrione at any location in either year. POST applications of mesotrione, particularly at 200 g/ha, caused significant phytotoxicity to ‘Calico Belle’ and ‘Del Monte 2038’. Other cultivars also showed phytotoxic symptoms; however, this injury was much reduced and did not occur at all locations each year. Sweet corn injury by mesotrione increased as rate increased. Del Monte 2038 also had significantly reduced plant height and yields. Other cultivars had no plant height or yield reductions because of POST applications of mesotrione.

Response of selected glyphosate-resistant broadleaved weeds to premix of fluthiacet-methyl and mesotrione (Solstice™) applied at two growth stages

“…(1 (O'Sullivan et al 2002;Armel et al 2003) and 58% transient leaf necrosis immediately after treatment with fluthiacet-methyl (Fausey et al 2001). Sellers et al (2009) reported that dogfennel [Eupatorium capillifolium (Lam.)…”

Sistemas primários de transporte de prótons integram os mecanismos de desintoxicação do mesotrione em plantas de milho

“…Os sintomas se desenvolvem mais rapidamente na presença de luz (Pallet et al, 1998;Wichert et al, 1999;Johnson & Young, 2002) O mesotrione causa em algumas variedades ou híbrido de milho sintomas de fitointoxicação, porém isso não resulta em perdas na produtividade de grãos (Furtado, 2004;Masiunas et al, 2004). O milho é tolerante ao mesotrione, provavelmente, devido à capacidade de desativação do princípio ativo e à translocação para compartimentos celulares -vacúolo e meio extracelular (Mitchell et al, 2001;Johnson & Young, 2002;O´Sullivan et al, 2002). A capacidade de realizar a desintoxicação de herbicida é desencadeada pelo aparato bioquímico celular (Kreuz et al, 1996).…”

Response of Eight Sweet Maize (<i>Zea mays</i> L.) Hybrids to Saflufenacil Alone or Pre-Mixed with Dimethenamid-P

“…However, other herbicides such as bentazon [11], isoxaflutole [17], mesotrione [13], nicosulfuron [14,23], nicosulfuron plus rimsulfuron [24,25], primisulfuron [16], prosulfuron [12] or thifensulfuron-methyl [18] have been shown to cause significant injury in some sweet maize hybrids.…”

“…Sensitivity of sweet maize to herbicides is dependent on the application dose, hybrid, and environmental conditions. Sweet maize hybrid sensitivity has been documented for foramsulfuron [10], bentazon [11], prosulfuron [12], mesotrione [13], nicosulfuron [14,15], primisulfuron [16], isoxaflutole [17], and thifensulfuron-methyl [18].…”