## 1 Introduction  
_Xanthomonas_ is a Gram-negative bacterium, belonging to the Xanthomonadacea family, which is widely distributed in all environments, including soils, water and plants. In the field of phytopathology, _Xanthomonas_ species have emerged as important pathogens causing diverse plant diseases; bacterial spot is one of the most serious, affecting numerous crops in subtropical tropical regions and leading to important economic losses worldwide [1, 2]. Recently, the causal agents of bacterial spot in tomato and pepper have been reclassified, being grouped into four lineages and three species: _X. euseiscatoria pv. euseiscatoria_ (previously _X. euseiscatoria_), _X. euseiscatoria pv. perforans_ (previously _X. perforans_), _X. vesicularia_ and _X. hortorum pv. gardneri_ (previously _X. gardneri_) [3, 4]. Several strategies have been employed for the management of bacterial spot, including the use of healthy seeds and transplants, seed treatment, crop rotation, culture practices, growing less susceptible cultivars and applying copper compounds or antibiotics [5, 6, 7, 8]. However, most of these methods have been inefficient for controlling the disease; in addition, the overuse of antibiotics has accelerated the emergence of _Xanthomonas_ pathways that are resistant to several antibiotics such as streptomycin, kanamycin, oxytetracycline, ampicillin and penicillin [9; 10], posing a challenge to disease management and raising public concern regarding the impact on environment and the potential effects on human health.  
Bacteriophages (or phages, for short) are viruses that naturally infect and kill bacteria. They are globally distributed and can be virtually isolated from diverse samples where their host bacteria are present. Phages may have different life cycles, including the lytic cycle, in which the phage infects its host bacteria and hijacks their metabolism for the production of new viral particles triggering bacterial lysis. Alternatively, phages may integrate into the bacterial genome and replicate, together with bacteria harboring the lysogenic cycle [11]. Because of the potential of lysing bacteria, phages have gained interest as an environmentally friendly alternative strategy to control bacterial infections, including in agricultural approaches for improving the management of phytopathogens making more sustainable food production [12].  
Specific phages infecting xanthomonads have been isolated and characterized, and some of them have been evaluated in biocontrol applications in several crops, such as peach, cabbage and tomato (Reviewed in [13]). Most of the described phages for bacterial spot possess lytic activity against _X. euvesicatoria_[14; 15], but few phages are lytic against _X. perforans_[16; 17]. So far, only four studies have described phages presenting lytic activity against _X. vesicatoria_, resulting in only five phage genomes being available in the GenBank database: XaF13 (MN335248), phiXaf18 (MN46129), vB_XveM_DIBBI (NC_017981, JN022534), Eir4 (OL581611) and Eisa9 (OL58161) [18; 19; 20]. Notwithstanding, a commercial formulation marketed as AgribnageTM for bacterial spot in tomato and pepper has been developed by Omnilytics [2]. Hence, genetic information about specific _X. vesicatoria_ phages has been underexplored, highlighting the lack of knowledge about their diversity and biology, and limiting the development of formulations for biocontrol applications.  
Herein, we describe two novel genera of jumbo phages (XaC1 and XbC2) with lytic activity against _X. vesicatoria_, which were isolated from water obtained from irrigation channels in tomato fields in Sinaloa, Mexico. We report their morphology, genome sequences and annotation, phylogenetic and comparative analyses and stability to temperature and pH. All taken together, our results indicate that these phages present unique properties that make them promising agents for the biocontrol of pathogenic bacteria.