Sweet Corn Cultivar Sensitivity to Bentazon

Abstract

Five sweet corn cultivars were evaluated for tolerance to bentazon in five field experiments conducted during 2 yr in Ontario. Bentazon was applied postemergence (POST) at 1.08 and 2.16 kg ai/ha, the highest registered rate and twice the highest registered rate, respectively, used in sweet corn in Ontario. When bentazon was applied POST at 1.08 and 2.16 kg/ha to sweet corn cultivar ‘DelMonte 2038’, injury included plant stunting and leaf damage ranging from 6 to 69% and 15 to 90%, respectively. Plant height was reduced to 48 and 100% of the untreated check when treated with bentazon at 1.08 and 2.16 kg/ha, respectively. The visual injury and height reductions were reflected in the marketable yields, which were reduced to 94% when treated with bentazon. Significant reductions in height and marketable yield were not observed in the other four cultivars tested. No correlation was observed between bentazon sensitivity and endosperm genotype. Based on visual injury ratings, sweet corn height, and marketable yield, it was concluded that ‘Calico Belle’, ‘GH 2684’, ‘Reveille’, and ‘Rival’ are tolerant to POST application of bentazon.

Herbicide selectivity in alfalfa crops

“…This fact can be attributed to the fast effect of this herbicide on the integrity of the membranes, leading to rapid and widespread leaf necrosis (Diebold et al 2004). This also explains the high values of phytotoxicity symptom even at half of the commercial dose applied ( Figure 2B).…”

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.…”

“…However, other studies have reported significant injury in some sweet maize hybrids with certain herbicides. Diebold et al (2003Diebold et al ( , 2004 [10] reported up to 94% reduction in yield with formsulfuron in sweet maize. Similar yield reduction were reported with mesotrione [13], nicosulfuron [14], foramsulfuron [10] and nicosulfuron plus rimsulfuron [24,25] in some sensitive 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].…”

New methods for haploid selection in maize

“…Laudis is a newly developed herbicide whose active ingredient is tembotrione, a member of the triketone class of herbicides (Santel, 2009 (Robinson et al, 1994), photosystem II (Diebold et al, 2004), and hydroxyphenyl pyruvate dioxygenase (HPPD). Acetolactate synthase from mutants of tobacco and cotton (Nicotiana tabacum, Gossypium hirsutum) for tolerance to a triazolopyrimidine sulfonanilide displayed different levels of insensitivity to feedback inhibitors valine and/or leucine (Subramanian et al, 1991).…”