Gray leaf spot on kikuyugrass vs. ryegrass

They are both called gray leaf spot or Pyricularia grisea, and they both cause a similar set of symptoms. But the strain of gray leaf spot that damages ryegrass is different than the one that damages kikuyugrass. Although both of these strains of gray leaf spot can occur on the same golf course at the same time, the kikuyugrass strain cannot infect ryegrass, according to a report that Dr. Frank Wong (University of California) has recently published and that we…