Cereal growers are being advised to target fields with significant brome populations and identify the brome species at harvest, to ensure autumn weed control plans are appropriate to the threat, says Dow AgroSciences
According to Dow’s cereal herbicide specialist, Stuart Jackson, brome species are most effectively controlled via autumn herbicide applications. However, a rush to get crops drilled and protected with a pre-emergence herbicide means later applications are too often omitted.
He says: “If growers can identify those fields with significant populations of brome and ryegrass they can be prioritised for autumn applications.
“Good field observations pre-harvest should include population density and brome species identification, since post-harvest control measures for sterile and great brome are different to those needed for soft, meadow and rye bromes.”
Where sterile or great brome is present in high populations, Mr Jackson advises opting for shallow cultivation post-harvest to encourage a germination flush before spraying with a non-selective herbicide.
Since sterile and great brome are the most difficult brome species to eradicate, he recommends controlling these weeds when they are small and actively growing, preferably between GS11 and GS13.
However, seeds of soft, meadow and rye bromes need to be left on the soil surface for one month to ripen before cultivation and subsequent spraying off with a non-selective herbicide.
Sterile Brome, Rye Brome and Meadow Brome (L to R). Correct I.D. important for managing seedbank. pic.twitter.com/dhFEcwphwV— David Jones (@CCCAgronomy)