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Susceptibility of the parasitoid Cephalonomia stephanoderis to different strains of Beauveria bassiana and Metarhizium anisopliae



Susceptibility of the parasitoid Cephalonomia stephanoderis to different strains of Beauveria bassiana and Metarhizium anisopliae



Southwestern Entomologist 22(2): 233-242



Laboratory bioassays at 27 +- 2 degree C, 90 +- 5% RH and 12:12 h L:D were used to determine the susceptibility of Cephalonomia stephanoderis Betrem (Hymenoptera: Bethylidae), a parasitoid of the coffee berry borer Hypothenemus hampei, to 9 strains of the entomopathogenic fungus Beauveria bassiana and 5 strains of Metarhizium anisopliae (Metsch.) Sorokin. The most virulent strains of B. bassiana were from Ecuador (code named Bb-4) and two from Mexico (Bb-26 and Bb-17) with CL-50's of 5.3 times 10-6, 219 times 10-6 and 29.3 times 10-6 conidia/ml respectively. Three aggressive strains of M. anisopliae were identified (code named Ma5, Ma23 and Ma4) with CL-50 values of 5.4 times 10-7, 7.6 times 10-7 and 10.6 times 10-7 conidia/ml respectively. Lethal time (LT-50) tests with B. bassiana showed a range of values between 3.8 and 6.8 days with a mean of 5.3 days. LT-50 values in M. anisopliae ranged from 4.4 to 7.2 days with a mean of 5.8 days. The highest incidence of sporulation of B. bassiana on parasitoid cadavers was observed in strains Bb-4 (Ecuador), Bb-17 and Bb26 (Mexico) all with values of 90%. In the case of M. anisopliae, the highest incidence of sporulation on insects was observed in strains Ma5 (84.3%), Ma4 (71.6%) and Ma23 (62.7%).

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