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Background   Frankliniella occidentalis  (Thysanoptera: Thripidae) is a highly rasping-sucking pest of numerous crops. The entomogenous fungi of  Lecanicillium  spp. are important pathogens of insect pests, and some species have been developed as commercial biopesticides. To explore  Lecanicillium  spp. resources in the development of more effective  F. occidentalis  controls, efficient barcode combinations for strain identification were screened from internal transcribed spacers (ITS),  SSU ,  LSU ,  TEF ,  RPB1 , and  RPB2  genes.    Results  Six genes were used to reconstruct  Lecanicillium  genus phylogeny. The results showed that ITS,  TEF ,  RPB1 , and  RPB2  could be used to identify the strains. All phylogenetic trees reconstructed by free combination of these four genes exhibited almost the same topology. Bioassay studies of a purified conidial suspension further confirmed the infection of second-instar nymphs and adult female  F. occidentalis  by seven  Lecanicillium  strains.  L. attenuatum  strain GZUIFR-lun1405 was the most virulent, killing approximately 91.67%  F. occidentalis  adults and 76.67% nymphs after a 7-day exposure.  L. attenuatum  strain GZUIFR-lun1405 and  L. cauligalbarum  strain GZUIFR-ZHJ01 were selected to compare the fungal effects on the number of eggs laid by  F. occidentalis . The number of  F. occidentalis  nymphs significantly decreased when  F. occidentalis  adults were treated with  L. cauligalbarum  strain GZUIFR-ZHJ01.    Conclusions  The combination of ITS and  RPB1  could be used for fast recognition of  Lecanicillium  spp. This is the first report of the pathogenicity of  L. attenuatum ,  L. cauligalbarum ,  L araneogenum , and  L. aphanocladii  against  F. occidentalis . Additionally,  L. cauligalbarum  strain GZUIFR-ZHJ01 caused high  F. occidentalis  mortality and inhibited the fecundity of the pest.

Fast Recognition of Lecanicillium spp., and Its Virulence Against Frankliniella occidentalis