Dear Mohammed, one prong of your approach could be to use the biophysical conditions that tend to favour M. anisopliae: the optimal temperaure, water activity and pH for instance (Appl Environ Microbiol 1996 62: 2435-2442; J Invert Pathol 1999 74:261-266). With regards, John
Chandler, D., hay, D., and Reid, A.P., (1997). Sampling and occurrence of entomopathogenic fungi and nematodes in UK soils. Applied soil ecology. 5: 133-141.