A product was developed, and will hopefully come to market very soon, which utilizes a fungus to cause mortality in bed bugs.
“Barrier treatment compositions using conidia of entomopathogenic fungi and methods for applying and using the same for bed bug population control and prevention are disclosed. The compositions and methods of the invention provide residual biopesticides control for bed bug populations using barrier treatment compositions transferring conidia of entomopathogenic fungi to a population of bed bugs providing effective kill within about 24 hours to about 10 days. The compositions and methods provide significantly enhanced horizontal transmission of the conidia of the entomopathogenic fungi providing enhanced bed bug control without detrimental effects of bed bug tolerance, resistance and/or negative impact on humans or animals contacting the residual biopesticides.”
When searching online, one can find some instances of people finding success with this fungus.