Irrigation Frequency and Fertilizer Type Influence Necrotic Ring Spot of Kentucky Bluegrass

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  • 1 Michigan State University, 102 Pesticide Research Center, East Lansing, MI 48824
  • | 2 Michigan State University, 102 Pesticide Research Center, East Lansing, MI 48824

Organic and synthetic fertilizers were evaluated under three irrigation regimes (daily, twice weekly, and rain only) for management of necrotic ring spot (Leptosphaeria korrae Walker & Smith) of Kentucky bluegrass (Poa pratensis L.). Disease severity varied due to fertilizer and irrigation treatments. After 2 years of treatments, daily irrigation reduced disease incidence as compared to twice-weekly irrigation, while organic fertilizer, as a feathermeal-bonemeal-soybeanmeal mixture, when applied monthly at 48.8 kg N/ha, reduced disease incidence as compared to urea fertilizer. For 2 of 3 years, differences in disease incidence were attributable to irrigation treatments, and after 4 years, all N fertilizers reduced disease incidence as compared to no fertilizer.

Contributor Notes

Dept. of Botany and Plant Pathology and the Pesticide Research Center.Dept. of Botany and Plant Pathology and the Pesticide Research Center.
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