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The diamondback moth (Plutella xylostella) is a major pest of broccoli worldwide. It mainly causes leaf defoliation and generates annual losses of 80%. In this study we evaluated the susceptibility of P. xylostella to entomopathogens Heterorhabditis bacteriophora HNI0100, Beauveria bassiana Bb9205 and Metarhizium anisopliae Ma9236. The methodology was based on the inoculation of third instar larvae of P. xylostella with 5x10 1 , 1x10 2 , 3x10 2 , 6x10 2 and 1,2x10 3 IJs/cm 2 of H. bacteriophora HNI0100 and evaluated them after 24, 48 and 72 h and 1x10 4 , 1x10 5 , 1x10 6 , 1x10 7 and 1x10 8 con/cm 2 of B. bassiana Bb9205 and M. anisopliae Ma9236, which were evaluated during two weeks. At a dose of 1,2 x10 3 JIs/cm 2 , P. xylostella had a susceptibility to H. bacteriophora HNI0100 of 91,66%. Similarly, B. bassiana Bb9205 and M. anisopliae Ma9236 had a mortality of 95,33 and 99,67% at 1x10 5 con/cm 2 . The results suggest that the use of strains of entomopathogenic nematodes and fungi is an innovative alternative for the control of P. xylostella. However, studies on the interaction of nematodes and fungi and Plutella xylostella are necessary.

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Susceptibility of Plutella xylostella (Lepidoptera: Plutellidae; Linnaeus 1758) to Beauveria bassiana Bb9205, Metarhizium anisopliae Ma9236 and Heterorhabditis bacteriophora HNI0100