Growth Responses of Zoysia spp. under Tree Shade in the Midwestern United States

'Meyer' zoysiagrass (Zoysia japonica Steudel) is commonly planted on home lawns and golf courses in the transition zone; however, poor shade tolerance limits its widespread use. This study was conducted to determine changes and differences in growth among selected Zoysia cultivars and progeny under a natural shade environment over a 3-year period in the transition zone. The study was initiated in June 2010 at the Rocky Ford Turfgrass Research Center in Manhattan, KS. Soil type was a Chase silt loam (fine, montmorillonitic, mesic, Aquic, Argiudoll). Zoysia genotypes were sodded in 0.37-m(2) plots and arranged in a randomized complete block with five replications under silver maple (Acer saccharinum L.) shade that resulted in a 91% reduction in photosynthetically active radiation (PAR). Genotypes included 'Zorro' [Z. matrella (L.) Merrill], 'Emerald' [Z. japonica x Z pacifica (Goudswaard) Hotta & Kuroki], 'Meyer', Chinese Common (Z. japonica), and experimental progeny Expl (Z. matrella x japonica), and Exp2 and Exp3 [(Z japonica X Z. pacifica) x Z japonica]. 'Zorro' and 'Emerald' experienced winter injury, which negatively affected their performance. Tiller numbers decreased 47% in 'Meyer' from June 2010 to June 2012, but declines in [(Z. japonica x Z pacifica) x Z japonica] progeny were only 1% for Exp2 and 27% for Exp3, and both Exp2 and Exp3 maintained high percent green cover throughout the study. In general, by the third year of evaluation, progeny of [(Z. japonica x Z. pacifica) x Z japonica] had higher quality ratings and higher tiller numbers than 'Meyer' and may provide more shade-tolerant cultivar choices for transition zone turf managers.