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Argentine Johnsongrass confirmed multiple herbicide resistant

Official Argentine researchers have confirmed multiple resistance from Johnsongrass (Sorghum halepense) to glyphosate and other herbicides. The first detection of resistance to glyphosate in Argentina came in 2005 from Johnsongrass. Earlier this year, growers in Santa Fe province reported resistance issues to graminicides, particularly haloxifop-R-methyl. Scientists from the agricultural technology institute, the INTA, have since tested and confirmed resistance to various active ingredients. “Multiple resistance to glyphosate and graminicides significantly limits alternative controls against the weed,” herbicide resistance knowledge network manager Martín Marzetti says. “But none of the resistant biotypes is demonstrating resistance to another class [cyclohexanediones or "dims"], which includes clethodim.”

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