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Commercial strains of entomopathogenic fungi were evaluated for control of chilli thrips,  Scirtothrips dorsalis  Hood (Thysanoptera: Thripidae), an invasive pest of ornamental and vegetable plants in the Caribbean and southeastern United States. In laboratory assays, LC 50  values against adult  S. dorsalis  were 5.1 × 10 4  CFU/mL for  Beauveria bassiana  GHA, with higher values 3.1 × 10 5  for  Metarhizium brunneum  F52 and 3.8 × 10 5  for  Isaria fumosorosea  Apopka 97. Second instars were comparatively less susceptible to all isolates, ostensibly due to moulting, with LC 50  values of 1.1 × 10 8 , 7.0 × 10 5 , and 9.9 × 10 5  CFU/spores per mL for GHA, F52, and Apopka 97 strains, respectively. In greenhouse cages, compared with controls, three applications of mycoinsecticides and other biorational insecticides at 7 to 14 day intervals reduced overall  S. dorsalis  populations on pepper plants  Capsicum annuum  cv. California Wonder: spinosad reduced populations by 94–99%,  M. brunneum  F52 by 84–93%,  B. bassiana  GHA by 81–94%,  I. fumosorosea  PFR-97 by 62–66%, and different horticultural oils by 58–85%. The proportion of marketable fruit was significantly increased by  M. brunneum  F52,  B. bassiana  GHA, and 2% SuffOil-X treatments. Slightly lower levels of control were observed in nursery tests with ornamental rose shrubs,  Rosa  sp. Red Double Knock Out®, during hot sunny conditions. Four applications reduced thrips populations over 10 weeks: spinosad by an average of 91%,  M. brunneum  F52 by an average of 81%,  B. bassiana  GHA by an average of 62%, SuffOil-X by an average of 50%, and  I. fumosorosea  PFR-97 by an average of 44%. The data show that mycoinsecticides can be used in management strategies for low to moderate populations of  S.   dorsalis  and provide resistance management tools for the limited number of insecticides that are effective against this pest.

Evaluation of Entomopathogenic Fungi Against Chilli Thrips,Scirtothrips dorsalis