2014-11-26 | permalink

Problems with glyphosate-resistant weed in GMO cultivated countries

Glyphosate resistance threatens Roundup hegemony - Nature Biotechnology

Argentina confirmed that Digitaria insularis is resistant to glyphosate and has invaded crops in the Northwest and Northeast regions of the country, and in the south of the Santa Fe province. This weed was previously classified on an yellow alert for suspected resistance to glyphosate.

The dose-response test to verify resistance was done by the Center of Herbicides Assessment of the Agrobiotechnology Institute of Rosario. The resistance index was 11.8, which means that a dose of 12 times higher would be required to control the Digitaria insularis comparing to non-resistant ones.

Both Paraguay and Brazil already had identified the Digitaria insularis biotypes resistant to glyphosate in 2005 and 2008, respectively. Currently, this specie is one of the major problems in both countries, and spreads rapidly in Brazil.

• New glyphosate-resistant weed is detected in Argentina - AgroPages.com
• Confirmed and suspect resistant weeds growing - Agri-View
• Farmers' war on weeds threatens neighboring vineyards - Houston Chronicle
• Impacts of genetically engineered crops on pesticide use in the U.S. -- the first sixteen years
• Field of weeds: Could agriculture crisis crop up from herbicide resistance? | PBS NewsHour