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Wednesday, 17 November 2004
D0581
Effects of three different biorrational pesticides on the mortality of the twospotted spider mite Tetranychus urticae (Acari: Tetranychidae)
Francisco Javier Saenz de Cabezon, fjsaenzdecabezon@ucdavis.edu1, Fernando Moreno, fernando.moreno@daa.unirioja.es2, Elena Martinez Villar, elena.martinez@daa.unirioja.es2, Ignacio Perez Moreno, ignacio.perez@daa.unirioja.es2, and Vicente S. Marco, vicente-santiago.marco@daa.unirioja.es2. (1) University of California, Department of Entomology, One Shields Ave, Davis, CA, (2) La Rioja University, Department of Agriculture and Food, Madre de Dios, 51, Logrono, La Rioja, Spain
The effects of three biorrational pestcides on the mortality of two-spotted spider mite Tetranychus urticae larvae were evaluated in the laboratory until protonymph stage using Probit analysis. The products tested were ALIGN‚(azadiracthtin), MATCH‚(lufenuron) and CASCADE‚ (flufenoxuron). The flufenoxuron showed the highest acaricidal activity against T. urticae larvae (DL50=1,307 ppm), followed by azadiracthin (DL50=93,121 ppm) and, finally, lufenuron (DL50=557,001 ppm). The probit-log dose lines fitted were estimated to be parallels. The flufenoxuron was 68 times more effective than azadiracthin and 433.5 times more effective than lufenuron. Due to its efficacy and the sublethal effects exhibited by benzoylphenyl ureas, flufenoxuron was also evaluated to deteminate this effect by rearing treated larvae until adult stage. In this case, the mortality recorded was two times higher than the one recorded until protonymph stage.
Species 1: Acari Tetranychidae Tetranychus urticae (twospotted spider mite)
Keywords: biorrational pesticides, Mortality
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