Toxicity and repellency of nine medicinal plants against Tribolium castaneum in stored wheat

Aqueous and methanolic plant extracts of Ambrosia tenuifolia Spreng., Baccharis trimera (Less.) DC, Brassica campestris L., Jacaranda mimosifolia D. Don, Matricaria chamomilla L., Schinus molle (L.) var. areira (L.) DC., Solanum sisymbriifolium Lam., Tagetes minuta L. and Viola arvensis Murray were tested in the laboratory for their insecticidal and repellent effectiveness against the red flour beetle, Tribolium castaneum (Herbst) (Coleoptera Tenebrionidae). The adult beetles were exposed to plant extracts by topical application and grain treatment. Mortality was recorded after 1, 2 and 7 days after exposure. The repellent action of these plant extracts was also studied. Only methanolic extracts showed activity. The highest mortality (68%) of T. castaneum was caused by V. arvensis on grain, followed by M. chamomilla (57%), B. campestris (56%) and J. mimosifolia (49%) after 7 days. Moreover, J. mimosifolia, M. chamomilla and T. minuta exhibited high repellency (IR = 0.04) against insects. The application of these botanicals may be promising in protecting of stored grains against coleopteran pests.Fil: Padin, Susana Beatriz. Universidad Nacional de La Plata. Facultad de Ciencias Agrarias y Forestales; ArgentinaFil: Fuse, Cecilia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Bioquímicas de La Plata "Prof. Dr. Rodolfo R. Brenner". Universidad Nacional de la Plata. Facultad de Ciencias Médicas. Instituto de Investigaciones Bioquímicas de La Plata ; ArgentinaFil: Urrutia, María Inés. Universidad Nacional de La Plata. Facultad de Ciencias Agrarias y Forestales; ArgentinaFil: Dal Bello, Gustavo. Universidad Nacional de la Plata. Facultad de Ciencias Agrarias y Forestales. Departamento de Ciencias Biológicas. Centro de Investigaciones de Fitopatología. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigaciones de Fitopatología; Argentin