Spatiotemporal Distribution of Potato-Associated <i>Alternaria</i> Species in Wisconsin

Potato early blight caused by Alternaria solani and potato brown spot alternata are two common foliar diseases. Fungicide applications in Wisconsin target with the expectation of managing simultaneously. However, distributions pathogens over time space have not been previously reported Wisconsin. In this study, six fields were systematically sampled during 2014 to 2017 investigate incidences both pathogens; compared location, timing, year. Incidence A. had recorded starting late June every field year, whereas incidence started later some fields. At end each growing season throughout four years, highest (100% most years) was observed a Plover, located concentrated production area central Wisconsin, Arena, an isolated southern The year) Madison, that managed organically. Such distribution patterns could be result different host ranges abundance inoculum geographic locations. 2016, disease severity correlated (P &lt; 0.0001 P = 0.0299), but 2017, 0.0799). These findings suggest spp. important for considering management strategies