Recent Examples on the WebThe long-term challenge will be making sure growers use a mixed-bag approach to reduce the likelihood that weeds will eventually mutate their way toward being able to feast on phosphite. Lynn Brezosky, San Antonio Express-News, 5 July 2018 The ptxD gene that allows absorption of phosphite was first isolated by William Metcalf of the University of Illinois. Lynn Brezosky, San Antonio Express-News, 5 July 2018