Abstract

LARREA IZURIETA, Isabel; FALCONI BORJA, Carlos  and  ARCOS ANDRADE, Andrea. Isolation and characterization of strains of Bacillus spp. With activity against Tetranychus urticae Koch in commercial crops of roses. Rev. colomb. biotecnol [online]. 2015, vol.17, n.2, pp.138-146.  Epub Aug 10, 2021. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v17n2.54291.

One of the species of mites that cause considerable qualitative and quantitative losses in roses growing under greenhouses in Ecuador is Tetranychus urticae, where conventional agrochemicals control is not effective; therefore seeks to identify strains of Bacillus spp. Isolated from T. urticae and determine their anatomical pathogenic scenarios for future control with bacteria. The field phase took place in Naranjo Roses S.A. in Latacunga in a growing roses under organic conditions, where they were collected sheets of each third of six plants with presence of T. urticae Koch. The samples were taken to be processed in Plantsphere Laboratories (PSL) in Quito. They were identified and quantified the different stages of the pest and some individuals were isolated for the presence of pathogenic strains of Bacillus spp., which were isolated, purified and identified. Check treatments of pathogenic were strains, distilled water (control) and Bacillus thuringiensis biovar acari (positive control). Pathogenic events were evaluated in adult females of T. urticae by citohistochemistry, where breakout of the outer walls, precipitation of cell contents and cuticular malformations were reported. It was determined that the largest numbers of pest individuals are located in the lower third (59.4%) with greater presence of eggs (63.3%). Using principal component analysis (PCA) of the treatments, the PSL 104, 113, 114 and Bacillus thuringiensis biovar acari was determined as the most efficient Biocatalytic Effectors (EBc©).

Keywords : citohistochemistry; Biocatalytic Effectors (EBc^©); source of infection; biological control; agrosystems.

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