2022 Spring Wheat Wild Oat Herbicide

Objective:                  

To evaluate herbicide combinations on weed control performance in spring wheat in environments and cropping systems representative of northwestern Montana     

Personnel:                 

Clint Beiermann, Lovreet Shergill, Jessica Pavelka

Summary:

Spring wheat was planted on April 27^th, 2022 and thirteen different herbicide combinations were tested, with a non-treated as a control (Tables 1 & 2). 

Treatments (2) Sharpen fb Axial Star, (5) Anthem Flex fb Axial Star, (6) Prowl fb Axial Star, (7) Axial Star, (8) Axial Star + Affinity TankMix, (9) Axial XL + Talinor + CoAct+, (10) Huskie + Axial XL, (11) Opensky, (12) Opensky + 2,4-D, and (13) Varro + Fluroxypyr all provided greater than 90% wild oat control. Treatments (3) Zidua and (14) WideMatch + Affinty TankMix had 30% or less control, while treatment (4) Zidua fb Axial Star had an average of 78% control (Table 3). All herbicide treatments applied, excluding treatment (3) Zidua, resulted in a high level of lambsquarter control.

Weed density was assessed four weeks after the final post treatments were applied. Wild oat was only present in the treatments (1) non-treated, (3) Zidua, (4) Zidua fb Axial Star, (12) Opensky + 2,4-D, & (14) WideMatch + Affinity (Table 4). Lambsquarter density was higher in treatments with poor control performance, including (2) Sharpen fb Axial Star, (3) Zidua, (4) Zidua fb Axial Star, (5) Anthem Flex fb Axial Star, (7) Axial Star, and (13) Varro + Affinity TankMix(Table 4). Treatment (7) Axial Star had an even higher density of lambsquarter than the non-treated, indicating little to no control.

Crop injury was generally low across treatments, excluding treatment (9) Axial XL + Talinor + CoAct+, (11) Opensky, and (12) Opensky + 2,4-D. These treatments caused 36.5-47.5% injury at two weeks after treatment (Table 5). The yields from treatments 9 and 11 were statistically less than many of the other treatments, indicating the injury may have influenced the yield (Table 5). There was a significant effect of herbicide treatment on spring wheat yield. Treatments (1) non-treated, (3) Zidua, (9) Axial Xl + Talinor + CoAct+, (11) Opensky, and (14) WideMatch + Affinty TankMix resulted in yield lower than other treatments.  The yields ranged from 66.6 bu/A to 98.0 bu/A with non-treated and (13) Varro + Fluroxypry, respectively.