FLORA ARVENSE ASOCIADA AL CULTIVO DE LA MORA (Rubus glaucus Benth.) EN LOS MUNICIPIOS PAMPLONA Y CHITAGÁ, NORTE DE SANTANDER, COLOMBIA

<p><strong>Background:</strong> Andean raspberry (<em>Rubus glaucus</em> Benth.) is one of the most cultivated species of the genus <em>Rubus</em> in colombian production systems, where it is characterized by the control of weeds through tillage and the use of herbicides, affecting biodiversity. <strong>Objective:</strong> To determine the diversity of weed flora associated with this crop in the municipalities of Pamplona and Chitagá, Norte de Santander, Colombia. <strong>Methodology:</strong> A descriptive observational study was carried out, with a cross-sectional field design, to determine the weed flora and chemical properties of soil samples from <em>R. glaucus</em> farms. The botanical composition and plant diversity of Shannon-Wiener (<em>H'</em>), Simpson (<em>D'</em>), Pielou (<em>J'</em>) and the Jaccard similarity coefficient (<em>I<sub>j</sub></em>) were determined in 18 farms, and the chemical properties of the soil were determined in only 10 of the sampled farms. <strong>Results:</strong> The floristic composition was represented by 120 individuals grouped in 36 families, 99 genera and 113 species. The subclass Dicotyledonae was the most abundant (78.33%). Asteraceae, with 27 species, was the family with the greatest species richness, followed by Poaceae (18) and Polygonaceae (6). The municipality of Pamplona presented the highest abundance (400 individuals), where <em>Galinsoga parviflora </em>(Asteraceae) was the most frequent species (4.75%). In Chitagá, <em>Persicaria nepalensis</em> and <em>Rumex crispus</em> (Polygonaceae) were the most frequent species (4.32 and 3.70%, respectively). Significant differences in species diversity were observed between the sampling areas (p≤0.05), for the number of species and individuals, and well as the Simpson and Shannon-Wiener indices. These differences exhibited an inverse trend between the two municipalities, except for the Pielou index. The municipality with the greatest diversity was Pamplona (<em>H'</em> = 3.476, <em>D'</em>= 0.968). There was a differentiated floristic composition among the municipalities (<em>I<sub>J</sub></em> = 51.33%) with 57 common species. <strong>Implications:</strong> The results highlight the need for localized weed management that considers their biodiversity as part of the production system and provide a basis for sustainable control strategies and future studies on allelopathy in <em>R. glaucus</em>. <strong>Conclusion:</strong> The floristic composition of the communities differed, with minimal similarity indicating that most species from one area do not occur in the other, implying that both are minor deposits of agrobiodiversity. These results suggest that in agronomic management, different weed populations should be considered for the yield of <em>R. glaucus.</em></p>