High populations of the sting nematode (depicted from Nomarski interference optics) were found in experimental plots, especially FX-313 St. Augustinegrass (foreground left of the previous frame), which showed severe thinning. Nematode pathogenicity was confirmed by the spot application of a systemic nematicide to the two stripes. 

Adapted from photo by: Dr. Robin M. Giblin-Davis

The highly susceptible FX-313 was a model host for studies of nematode population dynamics. There are presently no labeled, effective chemical controls for the sting nematode in St. Augustinegrass, so the only meager resorts are cultural management and resistant cultivars.