First report of stubby root caused by Trichodorus obtusus on zoysiagrass and Bermudagrass in South Carolina.
In September 2011, diagnostic samples were taken from bermudagrass cv. Tifway (Cynodon dactylon × C. transvaalensis) tees and from zoysia cv. Emerald (Zoysia japonica) roughs of a golf course in Charleston, South Carolina, USA. Additional samples were taken from a sod farm located near Charleston from a field of zoysia cv. Empire. Symptoms on bermudagrass and zoysiagrass included stubby roots and lightly to severely chlorotic or dead patches of irregular sizes and shapes. Nematodes were extracted, and the predominant nematode species recovered was Trichodorus obtusus. Nematode densities (per 100 cm3 of soil) were 30-170 (94 on average, n=5) at the sod farm and 30-230 (107 on average, n=7) at the golf course. This is thought to be the first report of T. obtusus on zoysiagrass and the first report of the species on bermudagrass in South Carolina.