title: Slow sand filters effectively reduce Phytophthora after a pathogen switch from Fusarium and a simulated pump failure.
abstract: Slow sand filtration has been shown to effectively reduce Phytophthora zoospores in irrigation water. This experiment tested the reduction of Phytophthora colony forming units (CFUs) by slow sand filtration systems after switching the pathogen contaminating plant leachate from Fusarium to Phytophthora and the resilience of the system to a short period without water, as might be caused by a pump failure. The slow sand filtration system greatly reduced Phytophthora CFUs and transmission after switching the pathogens. In addition, Phytophthora reduction by the slow sand filter was equally effective before and after the simulated pump failure. Reduction of Fusarium was not seen by the SSFs, before or after the simulated pump failure. The results suggest that slow sand filters are effective at reducing larger organisms, such as Phytophthora zoospores, even after a pump failure or a change in pathogens.
authors.affiliation: Department of Plant Sciences, University of California, One Shields Ave, Davis, CA 95616, USA. erilee@ucdavis.edu
authors.forename: Eric
authors.initials: E
authors.lastname: Lee
authors.forename: Lorence R
authors.initials: LR
authors.lastname: Oki
mesh_terms: D057914:Agricultural Irrigation; D004867:Equipment Design; D004868:Equipment Failure; D005374:Filtration / Q000379:methods*; D005670:Fusarium; D010838:Phytophthora / Q000472:pathogenicity; D012822:Silicon Dioxide; D014871:Water Microbiology; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D012822:Silicon Dioxide
keywords: CFU; Fusarium oxysporum; Phytophthora capsici; Plant pathogen; SSF; Slow sand filtration; Transmission assay; colony forming unit; slow sand filter