Tuesday, 16 November 2004 - 11:00 AM

Effect of fertilizer type and nitrogen rate on black cutworm, Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae) development and survivorship on turfgrass

Chris Williamson, rcwillie@entomology.wisc.edu, University of Wisconsin, Extension, 246 Russell Laboratories, 1630 Linden Dr, Madison, WI and Allison T. Walston, allison.walston@oregonstate.edu, Oregon State University, Department of Entomology, 3005 Experiment Station Drive, Hood River, OR.

The black cutworm, Agrotis ipsilon (Hufnagel), is a serious pest on golf courses, especially putting greens. Creeping bentgrass, Agrostis stolonifera L., is the most widely used and preferred cool-season turfgrass species used on putting greens and tee boxes. Turfgrasses require nitrogen fertility supplementation for growth to maintain turf quality. Specific nitrogen (N) application rates are dependent on turfgrass species; creeping bentgrass typically requires approximately 16.0 g nitrogen per m2 per year to maintain turf quality. The fertilizer types used on turfgrasses range from organic-based to synthetic fertilizers. A. ipsilon growth and survivorship were examined on creeping bentgrass turf treated with three nitrogen rates from two different fertilizer types, organic-based (Milorganite) and synthetic (urea). Compared to the unfertilized control, black cutworm larval development was significantly greater on the highest nitrogen rate of urea fertilizer, however no significant differences were observer between this treatment and the moderate nitrogen rate of urea fertilizer or the lowest nitrogen rate of Milorganite. Moreover, regardless of the fertilizer type or nitrogen rate, the likelihood of black cutworm survival was not significantly different among any of the fertilized treatments or the unfertilized control. Subsequently, lowering nitrogen fertility is not likely an effective management strategy for reducing black cutworm larval development, survival, and subsequent damage on golf course turf.

Species 1: Lepidoptera Noctuidae Agrotis ipsilon (Black cutworm)
Keywords: organic fertilizer, creeping bentgrass

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