| Summary: | Both palm weevils, the South American (<i>Rhynchophorus palmarum</i>) (SAPW) and the red palm weevil (<i>R. ferrugineus</i>, RPW), are present in South America, affecting commercial, ornamental, and native palms. These pests oviposit and thrive on selected Arecaceae. <i>R. palmarum</i> mainly infests coconut (<i>Cocos nucifera</i>), oil palms (<i>Elaeis guineensis</i>), and other ornamental and native palms in America, causing a significant social impact on growers. The weevils fulfill a significant ectosymbiotic macro- and microorganism role in the first period of larval development, worsening the damage which, during this period, is not yet apparent. Palm protection in the Brazilian context suggests the use of indigenous agents for microbiological biocontrol. This research identifies three Brazilian <i>Beauveria bassiana</i> isolates: CVAD01, CVAD02, and CVAD06. The results suggest that the strain’s impact on <i>R. palmarum</i> can also be compared with that of the commercial strain <i>Beauveria bassiana</i>. Phylogenetic analysis allowed the delimitation of species of <i>Beauveria</i> (Hypocreales). Pathogenicity tests caused significant mortality in <i>R. palmarum</i>. The isolates CVAD01, CVAD02, and CVADO6 showed high pathogenicity between 7 and 21 days, with mortality rates between 90 and 100%, suggesting that they may be effective biological control agents of <i>R. palmarum</i> in the field when used, within available means, to mitigate the impact of <i>R. palmarum</i> and <i>R. ferrugineus</i> in South America.
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