CONTINUED BLACKGRASS emergence and growth means growers must monitor weeds closely in order to achieve optimum herbicide timing, Chemega has advised.

Some weeds from the latest flush are already at two or three tillers and low dormancy, combined with warm weather has encouraged it to keep emerging, said the firm’s Joe McNicholl.

“Growers who applied a well timed pre-emergence are now in the best position to take control of blackgrass, in what are proving to be widespread and challenging situations.”

Where pre-em control could have been better if there had been more moisture, he advises growers to apply Atlantis (iodosulfuron + mesosulfuron) while blackgrass is still small and susceptible.

“It’s recommended that Atlantis is applied when the weed reaches 2-3 leaves, which we would expect to happen around this week, but growers should be watching closely because blackgrass is growing so fast this season.”

For effective anti-resistance management, he suggests combining Atlantis with a residual partner such as trifluralin, or pendimethalin where a pre-em has not been used or there is a particular broadleaf weed problem.

See FWi’s Crop Watch for the latest in-field reports from agronomists around the country.