(USDA/ARS) — Descendants of the fungus-like pathogen that caused the Irish potato famine in the 1840s — Phytopthora infestans — may have had a “helping hand” in recent U.S. outbreaks of the costly blight disease. Reporting in the September 2019 issue of Virus Research, a team of Agricultural Research Service (ARS), Cornell University (CU) and Rutgers University scientists announced they had identified a virus that …