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TURFGRASS SCIENCE

Spring Dead Spot Resistance and Quality of Seeded Bermudagrasses under Different Mowing Heights

^a Dep. of Horticulture & Landscape Architecture, Oklahoma State Univ. (OSU), 360 AG Hall, Stillwater, OK 74078-6027
^b Dep. of Plant & Soil Sci., Michigan State Univ., East Lansing, MI 48824
^c Dep. of Plant & Soil Sci., OSU, OK 74078
^d Dep. of Plant Pathology, Kansas State Univ., Manhattan, KS 66506
^e Dep. of Forestry, OSU, Stillwater, OK 74078

Corresponding author (hortdm1{at}okstate.edu)

Bermudagrass (Cynodon spp. L.C. Rich.) cultivars resistant to spring dead (SDS) caused by Ophiosphaerella herpotricha (Fr.) Walker and winter-kill are important for residential and commercial use in transition zone climates. Field research was conducted on ‘Mirage’, ‘OKS 91-11’, and ‘Jackpot’ seeded bermudagrasses [Cynodon dactylon (L.) Pers. var. dactylon] at Stillwater, OK, between 1996 and 1999 to determine their resistance to SDS. Plots were inoculated in 1996 with O. herpotricha isolate KS 188 and mowed to a height of either 1.3 cm or 3.8 cm. The SDS necrotic patch area of all cultivars increased each year and patch area was greater in turf at the higher mowing height. OKS 91-11 had a smaller SDS necrotic patch area than the other cultivars. Mirage had necrotic patch area equal to Jackpot at 1.3 cm and less necrotic area than Jackpot at 3.8 cm. OKS 91-11 had greater shoot survival density in necrotic patches than Jackpot or Mirage in 2 of 3 yr at 1.3 cm. Cultivars did not differ in shoot survival density at 3.8 cm. Higher overall quality was provided by OKS 91-11, when compared with Mirage and Jackpot in 3 of 4 and 2 of 4 yr, respectively. Jackpot had better quality than Mirage in 2 of 4 yr. Early spring green-up was negatively correlated with SDS patch size and positively correlated with shoot survival in SDS patches. Winter-kill was positively correlated with SDS patch size and negatively correlated with shoot survival in SDS patches.

Abbreviations: KS 188, Kansas State University Ophiosphaerella herpotricha isolate 188 • SAS, Statistical Analysis Systems • NP, necrotic patch • SDS, spring dead spot

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