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Call 8228804542 UPCOMING EVENTS About IWSS International Weed Science Society IWSS The International Weed Science Society IWSS was formed in 1975 by individuals from Europe North America South America and the AsianPacific area to deal with global weed science issues. The Society has held six highly successful International Weed Control Congresses in Australia 1992 Denmark 1996 Brazil 2000 South Africa 2004 Canada 2008 and China 2012. The IWSS is a worldwide scientific organization open to all who are interested in weeds and their control. The formation of IWSS was promoted actively by the six existing regional weed science societies.