Recently, Radova (2011) reported that the chemical pesticide fenpyroximate showed no adverse effect on virulence of entomopathogenic nematode Heterorhabditis bacteriophora but it reduced the virulence of Steinernema feltiae against the insect called mealworm Tenebrio molitor under laboratory conditions. For more information, read following papers on related topics
Garcia-Del-Pino, F. and Morton, A. 2010. Synergistic effect of the herbicides glyphosate and MCPA on survival of entomopathogenic nematodes Biocontrol Science and Technology. 20: 483-488.
Gutierrez, C., Campos-Herrera, R. and Jimenez, J. 2008. Comparative study of the effect of selected agrochemical products on Steinernema feltiae (Rhabditida : Steinernematidae). Biocontrol Science and Technology. 18: 101-108.
Negrisoli, A.S., Garcia, M.S., Negrisoli, C.R.C.B. 2010a. Compatibility of entomopathogenic nematodes (Nematoda: Rhabditida) with registered insecticides for Spodoptera frugiperda (Smith, 1797) (Lepidoptera: Noctuidae) under laboratory conditions. Crop Protection 29: 545-549.
Negrisoli, A.S., Garcia, M.S., Negrisoli, C.R.C.B., Bernardi, D. and da Silva, A. 2010b. Efficacy of entomopathogenic nematodes (Nematoda: Rhabditida) and insecticide mixtures to control Spodoptera frugiperda (Smith, 1797) (Lepidoptera: Noctuidae) in corn. Crop Protection. 29: 677-683.
Radova, S. 2011. Effects of selected pesticides on survival and virulence of two nematode species. Polish Journal of Environmental Studies. 20: 181-185.