Evaluation of beauveria bassiana and Metharhizium anisopliae (Mitosporic) upon white grub complex in south of Mexico
Laboratory bioassays, at 25 ± 2°C, 80 ± 5% HR and 12:12 h L:D, were conducted to evaluate several strains of B. bassiana and M. anisopliae on "white grub complex". All strains were pathogenic to Phyllophaga spp. larvae (L3) causing mortality from 28.3 to 61.6% by B. bassiana and from 21.6 to 90% by M. anisopliae. The strains that caused higher mortality were Bb26 (61.6%) of B. bassiana, and MaN7 (90%) of M. anisopliae. Lethal time (LT50) was 4.9 days (FL95 = 3.6 to 7.1) for Bb26 and 6.1 days (Fiducial Limits FL95 = 4.6 to 7.7) for MaN7. Lethal concentration (LC50) was 1.29 x 10 con/g with MaN7 strain and 1.15 x 1 0 con/g with the Bb26 strain, respectively. The application of B. bassiana did not reduce the damage done by larvae in terms of plant biomass production (total plant weight and stem weight) compared with the controls. However, the application of M. anisopliae had a negative effect on these two variables (reduction of plant biomass) with respect to the values found in the controls.
| Main Authors: | , , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Published: |
Tapachula, Chiapas, México El Colegio de la Frontera Sur
2000
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| Subjects: | Control biológico de plagas, Hongos entomopatógenos, Beauveria bassiana, Maíz, Phyllophaga, Metarhizium anisopliae, |
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