Lesser grain borer, Rhyzoperta dominica (Coleoptera: Bostrichidae) represent one of the most economically important primary storage pests on different commodities (wheat, peanuts, corn, legumes). As a consequence of developed R. dominica resistance to implemented insecticides ensue biocidal effect investigation of plant secondary metabolites. This is a possibility to identify an environmentally friendly and highly efficient a natural compound as insecticide. The aim of this study was to determine the potential biocidal effects of three widespread invasive species in area of the Čačak city Ailantus altisima, Portulaca oleracea and Ambrosia artemisiofoliа on the R. dominica laboratory population. Experimental studies were performed in laboratories at the Faculty of Agronomy in Čačak, Serbia. The crude ethanolic extracts A. altissima, P. olerace and A. artemisiofolia were prepared in aqueous solution concentration 0.1%, 1% and 5%. The potential biocidal effects on R. dominica was tested by measuring the inhalation effect, contact and contact-digestive activity on adults in laboratory conditions. Biocidal effects of plant extracts estimated according to Abbot‘s formula. In investigation of inhalation effect of all three plant extracts on R. dominica adults the highest level of efficiency (17.66%) had showed 5% solution of A. altisima. In investigation of contact effect of all three plant extracts on R. dominica adults the highest level of efficiency (68.33%) had showed 5% solution of P. oleracea. In investigation of contact - digestive effect of all three plant extracts on R. dominica adults on whole corn kernel, the highest level of efficiency (13.33%) had showed 0.1% solution of A. altissima. In investigation of contact - digestive effect of all three plant extracts on R. dominica adults on broken corn kernel, the highest level of efficiency (17.66%) had showed 5% solution of A. altissima and on the wheat grain the highest level of efficiency (35.33%) had showed 5% solution P. oleracea

Rhyzoperta dominica, Ailanthus altissima, Portulaca oleracea, Ambrosia artemisiofolia, biocidal effect

biology

Presentation: oral