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Ongoing trials probe optimum wild radish control

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About

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  • News

Date

18 June, 2019

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Location

Three Springs, Western Australia

Ongoing trials in WA investigating the performance of post-emergent herbicides in cereal crops have continued to highlight the benefits of Velocity® herbicide for superior control of wild radish and other broadleaf weeds.
Bayer Three Springs

Image: Bayer Business Development Manager Jeff Lander and Commercial Sales Representative Ty Gronow (right) with Planfarm consultant Nick McKenna during an inspection of the post-emergent herbicide trial near Three Springs last season.

A trial near Three Springs last season compared Velocity with another Group H and C herbicide, Talinor®, as well as other herbicide modes of action in Zen variety wheat, including any impact on crop safety from using the products.

The paddock where the replicated trial was conducted featured sandy soils and previously grew wheat in 2017 and canola in 2016.

Planfarm consultant Nick McKenna, who supports growers in a region from Three Springs through to Yuna and observed the trial throughout last season, said there was a reasonable population of wild radish in the trial area, assessed as 20-40 plants/m2.

Nick said the dry season in 2017 set up a weedy situation for many growers last year.

He said while some Group I resistant wild radish typically would be expected in the region, herbicide resistance testing of the population confirmed no resistance to MCPA LVE (Group I), diflufenican (Group F), glyphosate (Group M) or Velocity (Group H and C).

Applications in the trial, sprayed at the Z14-15 crop growth stage, included Velocity at 670 mL/ha and 600 mL/ha, the latter also applied in tank mixes with MCPA LVE at 440 mL/ha and Tigrex® at 500 mL/ha; Talinor at 1 L/ha and 750 mL/ha, the latter also applied in a similar MCPA LVE tank mix; Jaguar® at 1 L/ha, also applied with the MCPA LVE; Flight® at 720 mL/ha; and Precept® at 1.5L/ha applied with 1.2 L/ha of the adjuvant, Liase®.

There was some early crop phytotoxicity in treatments containing Jaguar, Flight and Tigrex, and some plants in the 1 L/ha Talinor application showed some bleaching of the newest leaf, however in each case the crop soon recovered and there was no biomass reduction.

Jaguar and Velocity in tank mixes with MCPA LVE, as well as the Velocity and Tigrex treatments, provided the strongest early control of wild radish. By 25 days after the applications, the Velocity treatments applied alone and the Talinor plus MCPA LVE application also showed a high level of control.

At the final rating, 70 days after the application, the Velocity treatments achieved wild radish control ranging from 93% through to the highest level of control in the trial at 96%. Talinor recorded control levels from 78% through to 91% with the addition of MCPA LVE. Whilst providing lower control levels initially, Precept plus Liase, as well as an application of MCPA LVE applied alone at 1.4 L/ha, showed 93% control by the final rating, which was understandable considering the susceptibility of wild radish at the site to Group I herbicides.

Nick said the improved control offered by Velocity in the trial was “noticeable’’, while the MCPA LVE applied in tank mixes and alone, also worked well.

The trial also showed the benefit of Jaguar mixes in suitable conditions and where there was no resistance to Group F herbicides.

“The control provided by other treatments ran out of puff and some of the radish recovered,’’ Nick said.

He said it was common throughout the region for growers to employ a two-spray strategy against wild radish, including an early application and another midway through the season.

“If there are multiple germinations, growers may go with Velocity early and then a phenoxy (Group I) spray a little later, or they may go with Jaguar or Jaguar/MCPA LVE and then straight Velocity or Velocity/MCPA LVE a little later.’’

The Three Springs trial followed similar trials at Mingenew, Arrino, Pithara and Cowcowing in 2017, where Velocity, including in tank mixes with MCPA LVE, also showed stronger activity against wild radish than other available products.

In addition to wild radish, Velocity, from Bayer, provides highly effective control of a wide range of broadleaf weeds including bifora, wireweed, bindweed, bedstraw, capeweed and doublegee.

About

Category

  • News

Date

18 June, 2019

Product

Location

Three Springs, Western Australia

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Post-emergent herbicide trials target wild radish control, crop safety