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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/21843

Title: Toxicity of pesticides on natural enemies of agricultural pests
Authors: Vargas, Robinson M.
Ubillo, Alejandrina F.
Keywords: selectivity, ecotoxicology, integrated pest management, beneficial insects, residual toxicity
Selectividad, ecotoxicología, manejo integrado de plagas, insectos benéficos, toxicidad residual, tiempo letal
Issue Date: 31-Dec-2001
Publisher: Instituto de Investigaciones Agropecuarias, INIA
Citation: Agricultura Técnica (ISSN: 0365-2807) Vol 61 Num 1
Abstract: A simple, precise and economic method was developed to evaluate the residual toxicity of a pesticide to natural enemies. The highest commercial dose recommended by the manufacturer was sprayed on Petri dishes using a Potter tower or immersing the dishes in a diluted solution of the pesticide. The relative toxicity of a pesticide was compared using mean lethal time (TL 50 's) in 4 categories. The first category comprised the most toxic responses between 0h< TL 50 < 2h, and included: Azinphosmethyl on Neoseiulus chilenensis   (Dosse) and Phytoseiulus persimilis   Athias-Henriot; Chlorfenvinphos on Amitus spiniferus   (Brèthes), Lysiphlebus testaceipes   (Cresson), Pauridia peregrina   Timberlake and Scutellista caerulea   (Fonscolombe); Chlorpyrifos on A. spiniferus , L. testaceipes , Metaphycus flavus   (Howard); P. peregrina and P. persimilis ; Diazinon on M. flavus and P. persimilis ; Esfenvalerate on P. persimilis ; Formetanate on Orius insidiosus (Say); Imidacloprid on A. spiniferus , L. testaceipes , M. flavus , P. peregrina , S. caerulea ; Methamidophos on O. insidiosus ; Methomyl on O. insidiosus ; Permethrin on N. chilenensis and P. persimilis . The second category consisted of TL 50 's between 2h< TL 50 < 5h and included: Chlorpyrifos on S. caerulea . The third category consisted of TL 50 's between 5h< TL 50 < 24h and included: Copper oxychloride on A. spiniferus and L. testaceipes . The fourth category consisted of TL 50 's after 24h>>TL 50 and included: Copper oxychloride on S. caerulea . The results of this study agree with those obtained by other researchers who used methods accepted by the International Organization for Biological Control of Noxious Animals and Plants (IOBC), which differ from the methodology utilized in this study. The results suggest that Lethal Time for 50% mortality is a quick, precise and economical method to establish the preliminary toxicity of a pesticide to natural enemies.
URI: http://hdl.handle.net/1807/21843
Other Identifiers: http://www.bioline.org.br/abstract?id=at01004
Rights: Copyright 2001 - Instituto de Investigaciones Agropecuarias, INIA (Chile)
Appears in Collections:Bioline International Legacy Collection

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