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The coconut hispine beetle,  Brontispa longissima  Gestro ,  is an invasive and economically important pest of palm trees in China.  Beauveria bassiana  has been used widely to control agriculture and forestry pests, for example,  Dendrolimus punctatus  Walker,  Pantana phyllostachysae  Chao, and  Basilepta melanopus  Lefevre. Until now, there is no published data on the use of  B. bassiana  against  B. longissima . In this study, we identified highly pathogenic  B. bassiana  strains against different developmental stages of  B. longissima  under laboratory conditions. The BB-01 strain presented the highest virulence against  B. longissima.  After inoculating with the BB-01 strain at (1.0 ± 0.5)  ×  10 7  spores·mL −1 for 10 d (28 ± 1°C with 95 ± 1% relative humidity), the corrected mortality of  B. longissima  adults reached 94.7% with a LT 50  of 5.3 days. Mortality on other developmental stages was 84.4 ± 3.3% (LT 50  = 5.8 d) for 1st-2nd instars, 76.1 ± 1.2% (LT 50  = 6.71 d) for 3rd-4th instars, 73.7 ± 1.1% (LT 50  = 6.98 d) for ≥5 instars, respectively. BB-01 median lethal concentrations (LC 50 ) against 1st-2nd instar, 3rd-4th instar, ≥5 instar larvae and adults for 6 d were 9.0 × 10 6 , 3.5 × 10 7 , 4.8 × 10 7 , 9.1 × 10 5  spores·mL −1 , respectively. The BB-01 strain exhibited a lethal effect peak on  B. longissima  at 6–7 d after treatment. This study provides basic data about the pathogenicity of different  B. bassiana  strains on  B. longissima .

Laboratory evaluation of pathogenicity of Beauveria bassiana strains against Brontispa longissima Gestro (Coleoptera: Hispidae)