Signs of Bacillus thuringiensis (Bacillales: Bacillaceae) infection in Myzus persicae (Hemiptera: Aphididae): Koch’s postulates
Keywords:
aphid, intoxicationAbstract
The basic step for establishing the causal agent of a disease involving microorganisms is the application of Koch’s postulates. The aim of this work was to confirm that the mortality of Myzus persicae (Sulzer) (Hemiptera: Aphididae) was due to Bacillus thuringiensis Berliner (Bacillales: Bacillaceae) strains (GP780, GP139, GP209, GP528, GP782, GP300, GP777, and GP402) and to document the signs of infection caused by 4 of these strains (GP300, GP528, GP402, and GP77). Our results suggest that the strains that were tested in the bioassays were responsible for the observed aphid mortality and that the physical changes were induced by infection with B. thuringiensis.
Sumario
Uno de los aspectos importantes para establecer el agente causal de una enfermedad que implica microorganismos es la aplicación de los postulados de Koch. El objetivo de este trabajo fue confirmar que la mortalidad observada en Myzus persicae (Sulzer) (Hemiptera: Aphididae) se debió a las cepas de Bacillus thuringiensis Berliner (Bacillales: Bacillaceae) (GP780, GP139, GP209, GP528, GP782, GP300, GP777 y GP402) y fotodocumentar los signos de la infección causados por cuatro de estas cepas (GP300, GP528, GP402 y GP77). Nuestros resultados sugieren que las cepas que fueron inoculadas en los bioensayos son las responsables de la mortalidad de los áfidos y que los cambios físicos observados fueron inducidos por la infección con B. thuringiensis.
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