Brian M. Schwartz, Kevin Kenworthy, and William Crow. University of Florida, 304 Newell Hall, P.O. Box 110500, Gainesville, FL 32611-0500
Widespread infestation of the plant-parasitic sting nematode, Belonolaimus longicaudatus, has been described throughout Florida and on Zoysia spp. as early as the 1950’s. Sandy, well-drained soils in Florida provide a suitable environment for this ectoparasite to reproduce and maintain large population numbers which are able to inflict significant injury on turfgrass. Susceptibility of zoysiagrass to sting nematode currently limits its use on golf courses and home lawns constructed primarily with sand-based soils. Therefore, an experiment was conducted to determine the level of sting nematode resistance/tolerance of zoysiagrass cultivars. Resistance was based on the number of nematodes present 90 days after inoculation. Higher counts indicated greater reproduction in the presence of a cultivar while lower counts indicated some level of resistance. Tolerance levels were identified by comparing root lengths of inoculated plants with non-inoculated plants. Cultivars with greater root lengths despite supporting a population of nematodes were designated as tolerant.