Evaluación de agentes biológicos para el control y mitigación del daño ocasionado por Ralstonia solanacearum en Eucalipto Tropical a nivel de vivero, en la hacienda Los Ángeles, cantón Buena Fé, provincia de Los Ríos.

Abstract

The following investigation proposed to evaluate biological agents to control and mitigate the damage caused by Ralstonia solanacearum to tropical eucalyptus at a nursery level. This research work took place in Los Ángeles farm, Buena Fe canton in Los Rios province. The trial of this investigation was structured in 12 treatments as it follows: (T1: Bioprot+ 15cc/L+ 1/day); (T2: Bioprot+ 15cc/L+ 1/ week); (T3: Bioprot+ 15cc/L+ 1/ 15 days); (T4: Bioprot+ 15cc/L+ 1/ 1 month); (T5: Biofung+ 15cc/L+ 1/day); (T6: Biofung + 15cc/L+ 1/ week); (T7: Biofung + 15cc/L+ 1/ 15 days); (T8: Biofung + 15cc/L+ 1/ 1 month); (T9: Biofung +Bioprot + 15cc/L+ 1/day); (T10: Biofung +Bioprot + 15cc/L+ 1/ week); (T11: Biofung +Bioprot + 15cc/L+ 1/ 15 days); (T12: Biofung +Bioprot + 15cc/L+ 1/ 1 month). Each treatment was applied in three repetitions (5 plants/ repetition). A complete randomized design (CRD) was used and the variables stated in the specific objectives were evaluated: the effect (number of dead leaves), the severity (affectation percent), the mortality (number dead plants). During the assessment process, the plants were watered and fertilized to maintain their strength. As a final result, it was determined that the bacteria impact at the initial stage was 60 % and at the final stage was 71, 42 %. According to Ureta (2016), the acceptable range has to be less than 5 %. The severity reached a 32,63 % at the initial stage and a 79,20 % at the final stage. According to Bock et.al (2010) the acceptable range is (˂ 10 %) and for Sauceda et.al (2009), (˂ 8 %). Finally, after checking that the mortality was 100%, it was concluded that these treatments don’t control the bacteria and these products don’t generate positive results.

Key words: ˂BIOLOGICAL AGENTS ˃, ˂ BIOLOGICAL CONTROL ˃, ˂TROPICAL EUCALYPTUS ˃, ˂FOREST NURSERY˃.