Synergistic action of entomopathogenic hyphomycetes and the bacteria Bacillus thuringiensis ssp. morrisoni in the infection of Colorado potato beetle Leptinotarsa decemlineata

Vadim Yu. Kryukov, Viktor P. Khodyrev, Olga N. Yaroslavtseva, Andrea Kamenová, Бахытжан Дуйсембеков, Viktor V. Glupov

2009

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DOI 10.1134/s000368380905010x
Data confidence 85 high
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Abstract

A synchronous coinfection of the Colorado potato beetle Leptinotarsa decemlineata (Say) with the entomopathogenic bacteria Bacillus thuringiensis ssp. morrisoni Bonnifoi & de Barjak var. tenebrionis Krieg et al. and hyphomycete Metarhizium anisopliae (Metsch.) Sorokin or Beauveria bassiana (Bals.) Vuill leads to the rapid death of 95-100% of larvae. The bacteria arrest the nutrition of insects, while the fungal spores kill the weakened larvae. The synergistic effect of two pathogens is recorded at a relatively low hyphomycete titer (1-5 x 10(6) conidia/ml) and is evident in the mortality dynamics at all larval ages. These bacterial and fungal pathogens display no antagonism on artificial nutrient media. This microbial complex is highly efficient under natural conditions (80-90% larval mortality rate and no plant defoliation).