Hi Erin... I have foraging grass for my Guinea Pigs and what we have here locally in Northern Ontario that grows wild off the side walks is Timothy, Kentucky Bluegrass, Canadian Bluegrass, Canadian Bluejoint, Quackgrass... and Yellow Foxtail. The most abundant is the yellow (I have been calling it "Golden Foxtail" - I watched this video and now corrected) The Yellow Foxtail is the easiest to get the most abundant however it seems to have the most disease... I am trying to identify the diseases ... The leaves have bumps on the underside "Nodules" and sometimes have white spots on leaves as well - I have taken pictures of it - do you know how I can identify theses diseases?