Association of Official Seed Certifying Agencies (AOSCA) CEO Chet Boruff notes efforts are being intensified to assure seed purity for 2007 amid demand for a growing variety of biotech crops and concern over export “contamination.” [...] Boruff noted seed genetic purity is a “very big issue” especially for the GMO-sensitive European Union, a major U.S. corn gluten buyer that has influenced biotech acceptance policies among U.S. grain processors. But assuring purity poses an equally large challenge for the seed industry.