Evaluation of the Efficiency of the Biocide Oxymatrine in Controlling the Different Roles of the Saw-Grain Beetle Oryzaephilus surinamensis (L.) (Silvanidae: Coleoptera) in the Laboratory

Abstract

A study was conducted to evaluate the effectiveness of the biocide of plant origin, Oxymatrine, against the second and fifth larval instars and adults of the Sawgrain beetle Oryzaephilus surinamensis (L.) under laboratory conditions. The results showed the efficiency of the biocide Oxymatrine in causing death rates for adults and larval instars at all concentrations of (1.5, 2, 2.5) ml/liter. The highest death rates were for the second larval stage, which reached 100%, and all concentrations after 3 days of treatment. In contrast, the mortality rates were given for the last (fifth) larval instar and adults after 14 days of treatment. For the fifth larval instar, the mortality rates reached (63.92%, 67.78%, and 70.35%) at concentrations (1.5, 2, 2.5) ml/l, respectively. The death rates were for adult females (52.14%, 53.57%, and 55.71).