Resistance confirmed to double knock for fleabane

THE popular ‘double knock’ strategy to control weeds has shown some weakness when it comes to the control of tall fleabane.

Resistance confirmed to double knock for fleabane Resistance confirmed to double knock for fleabane Resistance confirmed to double knock for fleabane Resistance confirmed to double knock for fleabane Resistance confirmed to double knock for fleabane

NSW Department of Primary Industries weeds researcher, Dr Md Asaduzzaman (Asad) has uncovered disturbing evidence of double-knock resistance in tall fleabane (Conyza sumatrensis) samples collected during weed surveys funded by the Cotton Research and Development Corporation (CRDC). Picture courtesy WeedSmart

NSW Department of Primary Industries weeds researcher, Dr Md Asaduzzaman (Asad) has uncovered disturbing evidence of double-knock resistance in tall fleabane (Conyza sumatrensis) samples collected during weed surveys funded by the Cotton Research and Development Corporation (CRDC).

"Our surveys in 2016 and 2017 showed that cotton fields were generally weed-free but herbicide resistance is building in weeds along farm roadsides, drains and channels and around infrastructure," he said.

"We identified two tall fleabane biotypes that have resistance to glyphosate, paraquat and the double-knock tactic of an initial glyphosate application followed with an application of paraquat seven days later."

The double-knock is a widely-utilised and highly effective weed manag...

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