Turf IPM Advisory • 2017- turf Fertilization, Necrotic Ring Spot, Overseeding October 10, 2017455 Views Print or PDFClick here for this issue, which contains updates on: Necrotic ring spot causes dead patches of turf that may regrow in the centers. Late Fall Fertilization of Athletic Fields Necrotic Ring Spot Overseeding Recommended Cultural Practices for Fall