June 14: WSU Weed Science Field Tour June 12, 2017 PULLMAN, Wash. – WSU crop and soil science experts share the latest tools in the fight against farm weeds at the 2017 Weed Science Field Tour, 1:30 p.m. to 5 p.m., Wednesday, June 14, at the R.J. Cook Agronomy Farm near Pullman.