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Among 28 isolates of  Beauveria bassiana  tested for virulence against  F. occidentalis  in laboratory bioassays, we found strain SZ-26 as the most potent, causing 96% mortality in adults at 1×10 7  mL −1 conidia after 4 days. The effect of the strain SZ-26 on survival, longevity and fecundity of the predatory mite  Neoseiulus  ( Amblyseius )  barkeri  Hughes were studied under laboratory conditions. The bioassay results showed that the corrected mortalities were less than 4 and 8% at 10 days following inoculation of the adult and the larvae of the predator, respectively, with 1×10 7  conidia mL −1  of SZ-26. Furthermore, no fungal hyphae were found in dead predators. The oviposition and postoviposition durations, longevity, and fecundity displayed no significant differences after inoculation with SZ-26 using first-instar larvae of  F. occidentalis  as prey in comparison with untreated predator. In contrast, the preoviposition durations were significantly longer. Observations with a scanning electron microscope, revealed that many conidia were attached to the cuticles of  F. occidentalis  at 2 h after treatment with germ tubes oriented toward cuticle at 24 h, penetration of the insect cuticle at 36 h, and finally, fungal colonization of the whole insect body at 60 h. In contrast, we never observed penetration of the predator's cuticle and conidia were shed gradually from the body, further demonstrating that  B. bassiana  strain SZ-26 show high toxicity against  F. occidentalis  but no pathogenicity to predatory mite.

plos one

An Entomopathogenic Strain of Beauveria bassiana against Frankliniella occidentalis with no Detrimental Effect on the Predatory Mite Neoseiulus barkeri: Evidence from Laboratory Bioassay and Scanning Electron Microscopic Observation