Oatmeal-dodine agar was used as a selective medium to enumerate colony-forming units (CFU's) of the entomogenous fungus Beauveria bassiana (Balsamo) Vuillemin in sterilized soil following the simultaneous application of conidia with six selected herbicides used in pecan management. At 3 days after treatment, significantly (P < 0.05) fewer CFU's were recovered from soils treated with recommended rates of either diuron, norflurazon, paraquat, simazine, or terbacil than were recovered from soils that were not treated with herbicides or were treated with glyphosate. By 7 days after treatment, numbers of CFU's recovered from the soils did not differ significantly among the herbicide treatments and the controls.
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Harrison et al. (1992) studied this question.