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This work evaluated the short-range mortality of workers of Ectatomma brunneum Smith when exposed to ant baits in laboratory, in order to verify if the attractiveness of this non-target species by ant baits intended to be used in the control of leaf-cutting (target) ants might be harmful to the population studied. Workers were exposed in laboratory for 48 hours to ant baits used in pastures to control the leaf-cutting ants Atta capiguara Goncalves (Formicidae: Attini) and Atta bisphaerica Forel (Formicidae: Attini), the major species that cause damage to pastures. The following formulations of granular bait ant-killer active ingredients sulfluramid 0.3%, fipronil 0.003% and chlorpyrifos 0.45% were used. The experiment outline was composed by groups of 30 workers exposed to 10g of moistened ant baits, using three repetitions. Daily follow-up on mortality was performed for 20 days, recording dead and intoxicated workers. The control group received only 10g of moistened citric pulp. From the results achieved, survival curves as a function of observation time were plotted using the Kaplan-Meier method and compared applying the Logrank test (nonparametric) at 5% significance level. The results revealed that the three active ingredients tested were toxic and the population reduced 35.56% in the treatment with chlorpyrifos, 31.11% with sulfluramid and 30% with fipronil. Exposicao de Operarias de Ectatomma brunneum Smith (Hymenoptera: Formicidae: Ectatomminae) a Iscas Formicidas Contendo Diferentes Ingredientes Ativos em Condicoes de Laboratorio Resumo. Este trabalho avaliou a mortalidade a curto prazo de operarias de Ectatomma brunneum Smith expostas a iscas formicidas em laboratorio, a fim de verificar se a capacidade de atracao desta especie nao-alvo a formicidas destinadas ao controle de formigas cortadeiras (alvo) pode ser prejudicial para a populacao estudada. As operarias foram expostas em laboratorio por 48 horas a iscas formicidas utilizadas em pastagens para controlar as formigas cortadeiras Atta capiguara Goncalves (Formicidae: Attini) e Atta bisphaerica Forel (Formicidae: Attini), as principais especies que causam danos as pastagens. Foram utilizados os seguintes ingredientes ativos: sulfluramida 0,3%, fipronil 0,003% e clorpirifos 0,45%. O experimento foi composto por grupos de 30 operarias expostas a 10g de formicidas, usando tres repeticoes. Foi realizado o acompanhamento diario da mortalidade durante 20 dias, registrando-se o numero de operarias mortas e intoxicadas. O grupo controle recebeu apenas 10g de polpa citrica umedecida. A partir de resultados obtidos, as curvas de sobrevivencia em funcao do tempo de observacao foram plotadas usando o metodo de Kaplan-Meier, e comparadas com aplicacao do Logrank test (teste nao-parametrico) em nivel de significância de 5%. Os resultados revelaram que os tres ingredientes ativos testados foram toxicos e a populacao reduzida em 35.56% no tratamento com clorpirifos, 31,11% com sulfluramida e 30% com fipronil.

entomobrasilis

Exposure of Workers of Ectatomma brunneum Smith (Hymenoptera: Formicidae: Ectatomminae) to ant Baits Containing Different Active Ingredients under Laboratory Conditions