**3. Results**

A total of 42 fungal isolates were obtained from the analyses of 20 root samples taken from plants native to the CGNP. All fungal isolates were obtained in pure cultures using standard techniques. The isolates were identified as filamentous fungi belonging to the phylum Ascomycota. The fungal isolates were identified to the genus level. *Aspergillus*, *Trichoderma* sp., *Rustroemia* sp. and *Penicillium* sp., were the most characteristic genera. They differed in color, type of conidiophore or presence of microsclerotia-like structures. Therefore were considered to be different. The presence of the genus *Paecilomyces* was especially relevant, and this genus was thus selected for this study (isolate CDG33). The amplified sequences of isolate of *Paecilomyces* were compared with available DNA sequences using BLAST, having 99% homology with *Paecilomyces variotii* accession number JX282326.1.
