Nebraska Extension will be hosting a Resistant Palmer Amaranth Management Field Day Tuesday, July 12, near Shickley to demonstrate control options in corn. Keynote speaker will be Jason Norsworthy, professor and endowed chair of Weed Science at the Unversity of Arkansas. Norsworth has documented eight herbicide-resistant weeds in Arkansas, including glyphosate-resistant Palmer amaranth.
Growers, crop consultants and educators are encouraged to attend Nebraska Extension's Weed Management Field Day from 8 a.m. to 1 p.m. June 29 at the South Central Agricultural Laboratory near Clay Center.
As growers look for new opportunities to rotate herbicide active ingredients, combination herbicides may offer the benefits they're looking for. Acuron™ is a combination of four herbicide active ingredients: atrazine (10.93%), bicyclopyrone (0.65%), mesotrione (2.6%), and S-metolachlor (23.4%) plus the safener benoxacor. Acruron may be used pre-emergence and post-emergence in field corn, seed corn, and silage corn. Acuron may also be used in sweet corn and yellow popcorn, but the application must be made prior to crop emergence or serious crop injury may occur.
Due to rain the last couple of weeks and more forecast for next week, some growers may not be able to apply burndown herbicides when they would like to for utmost effectiveness. Low temperatures and wet weather can negatively impact herbicide performance.
DiFlexx™ DUO is a herbicide for control of annual broadleaf and grass weeds in field corn, corn grown for silage, popcorn, and seed corn and for post-harvest burndown weed control. It is a premix of DiFlexx (dicamba: 19.73%) and Laudis (tembotrione: 2.83%).
Several new herbicides have been registered for weed control in corn. These herbicides do not have an active ingredient with a new mode of action, but rather are pre-mixtures of existing herbicides. They can provide excellent weed control if applied according to label directions. A season-long weed management plan should include herbicides with multiple modes of action.