Subj: Roundup Resistant Weed Confirmed Date: 01-02-19 07:12:45 EST From: [log in to unmask] (Laurel Hopwood) Sender: [log in to unmask] (Biotech Forum) Reply-to: [log in to unmask] (Biotech Forum) To: [log in to unmask] (forwarded with permission from Dr Benbrook) A story in "Successful Farming" accessible at <http://www.agriculture.com/default.sph/AgNews.class?FNC=topStoryDetail__ANews in dex_html___44941___1> confirms the emergence of Roundup resistant horseweed (marestail) in Delaware, following several years of Roundup use first as a no-till burndown, and recently as a burndown and over the top spray with RR beans (several fields probably treated three times). Three significant pieces of information are in the story -- * Resistance is present to both Roundup (glyphosate) and the closely related Touchdown (sulfosate, or glyphosate-trimesium) herbicides. Many in the GM-community had argued that cross-resistance was not likely, but as predicted by many other weed scientists, it has now occurred. * Resistance is at a very high level -- 10-X full application rates of both a.i.'s had no impact on the resistant weeds. * Resistance is transferred via the seed to the next generation. [log in to unmask] Charles Benbrook Ag BioTech InfoNet <http://www.biotech-info.net> Benbrook Consulting Services CU FQPA site <http://www.ecologic-ipm.com> 5085 Upper Pack River Road IPM site <http://www.pmac.net> Sandpoint, Idaho 83864 Voice: (208)-263-5236 Fax: (208)-263-7342 E-mail: <[log in to unmask]> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - For SC email list T-and-C, send: GET TERMS-AND-CONDITIONS.CURRENT to [log in to unmask]