Susceptibility of Rhyzopertha dominica (Coleoptera: Bostrichidae) and Sitophilus oryzae (Coleoptera: Curculionidae) to the fungal entomopathogen Beauveria bassiana (Balsamo-Crivelli) Vuillemin s.l. (Hypocreales: Clavicipitaceae)

VIANNA MARÍA FLORENCIA; RUSSO MARIA LETICIA; TRONCOZO MARÍA INES; FERRERI, NATALIA A.; DE ABAJO JUAN MANUEL; SCORSETTI ANA CLARA; PELIZZA SEBASTIAN ALBERTO

REVISTA DE LA FACULTAD DE CIENCIAS AGRARIAS DE LA UNIVERSIDAD NACIONAL DE CUYO

UNIV NACIONAL CUYO

Lugar: Mendoza; Año: 2023 vol. 55 p. 56 - 84

0370-4661

Control measures of stored grain pests include the excessive utilization of chemicalinsecticides that generate negative environmental impact. Current trends in integratedpest management are oriented towards the preservation of the environment using naturalbiopesticides, among these products arise entomopathogenic fungi. This study aimed to testthe efficacy of a native strain of Beauveria bassiana to control two main stored grain pestssuch as Sitophilus oryzae and Rhyzopertha dominica and also evaluate the persistence of thefungus on wheat grains. The B. bassiana strain controlled 89%±0.07 of R. dominica adultsand 80% ±0.14 of S. oryzae. The survival analysis showed that MST was 4.27 ±0.19 daysfor R. dominica adults and 4.27 ±0.20 days for S. oryzae. Furthermore, results of long ranktest for the comparison of the Kaplan-Meier curves did not present significant differencesbetween the survival of both stored grain pests. Dual choice tests demonstrated thatB. bassiana LPSc1227 presented a repellent action against both stored grain pests. Theseed persistence of conidia was 100% in treated seeds after 45 days. Further research willcontribute to elucidate more insecticidal features of the B. bassiana LPSc 1227 strain againstS. oryzae and R. dominica, two main stored grain insect pests.