1. Laboratories of Virology and Bee Pathology, Faculty of Agronomy, Universidad de Concepción, Chillán, Chile
2. Laboratory of Chemical analysis, Faculty of Agronomy, Universidad de Concepción, Chillán, Chile
3. Department of Basic Science, Faculty of Science, Universidad Santo Tomás, Osorno, Chile
4. Departament of Plant Production, Faculty of Agronomy, Universidad de Concepción, Chillán, Chile