The nematodes in general were attacked by Nematode egg parasitic fungi or by nematode trapping fungi (e.g.. Harposporium) commonly known as nematophagous fungi which has special appendages to predate on nematodes. The Beauvaria bassiana kills insect and not nematodes.

for further you can searc below article for fungi predating on nematodes.

Dowe, Asmus (1987): Räuberische Pilze und andere pilzliche Nematodenfeinde. A. Ziemsen Verlag; Wittenberg

Dear Brenda Gaines

As Naturally occurring in the soils of numerous regions globally, an entomopathogenic fungi that causes white muscadine disease in a range of insects .Beauveria bassiana is mainly used to target foliar pests as many soil dwelling pests have developed a natural resistance to B. bassiana since it is native to such a range of regions. For this reason, close examination of the pest insect(s) for correct identification should be done before applications to the soil are made. A major advantage to using Beauveria bassiana is the fact it can be used up until the day of harvest as the residue is not harmful to consumers . As with any insecticide, follow all safety precautions on the label when using B. bassiana products. http://www.arbico-organics.com/category/beauveria-bassiana-control-products

Pls. find the attached files

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3407864/

http://blog.bugsforgrowers.com/natural-predators/entomopathogenic-nematodes/beneficial-nematodes/beneficial-nematodes-for-rhipicephalus-boophilus-microplus-control/

http://www.arbico-organics.com/category/beneficial-nematodes-faqs

Regards      

Prof. Houda Kawas

Dear Brenda, 

Check these papers:

- Effects of combining an entomopathogenic fungi or bacterium with entomopathogenic nematodes on mortality of Curculio caryae (Coleoptera: Curculionidae) by Saphiro-Illan et al. (2004)

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3578468/

- Efficacy of Entomopathogenic Nematodes and Entomopathogenic Fungi

against Masked Chafer White Grubs, Cyclocephala spp. (Coleoptera: Scarabaeidae) by Wu (2013)

https://vtechworks.lib.vt.edu/bitstream/handle/10919/50620/Wu_S_D_2013.pdf?sequence=1

- Effects of a dual application of entomopathogenic nematodes and entomopathogenic fungi against a forest pest, Hylobius abietis L. (Coleoptera: Curculionidae) and a horticultural pest, Otiorhynchus sulcatus F. (Coleoptera: Curculionidae) by Hennessy (2012)

http://eprints.maynoothuniversity.ie/4472/1/Roseanne_Hennessy_MSc_Thesis.pdf

- Field trials against Hoplia philanthus (Coleoptera: Scarabaeidae) with a combination of an entomopathogenic nematode and the fungus Metarhizium anisopliae CLO 53 by Ansari et al. (2006)

http://www.sciencedirect.com/science/article/pii/S1049964406001848

Regards,

Adrià