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A cultura do arroz irrigado apresenta grande importância economica e social nos Estados de Santa Catarina e no Rio Grande do Sul (Brasil) e destaca-se tambem pelo uso intenso de agroquimicos, especialmente herbicidas e inseticidas. Experimentos foram conduzidos em laboratorio para avaliar a toxicidade aguda de alguns agroquimicos utilizados em arroz irrigado, visando estabelecer as concentracoes de risco bem como os possiveis efeitos que tais produtos possam apresentar sobre organismos nao alvo. A especie empregada como indicadora foi a carpa-comum em funcao da sua utilizacao em consorcios de arroz com peixe. Foram testados individualmente os herbicidas Ally (Metsulfuron), Gamit (Clomazone), Goal (Oxifluorfen), Ronstar (Oxadiazon) e Sirius (Pirazosulfuron) e o inseticida Furadan (Carbofuran). Os resultados indicaram grande variacao entre os produtos quanto a toxicidade para a especie testada. O indice de seguranca, estimado pela relacao entre a CL50 e a concentracao provavel utilizada na lavoura, foi de 0,82; 2,76; 5,93; 8,87; 13,94; 4.000 e 7.878, respectivamente para os agroquimicos Furadan, Ronstar, Goal, Facet, Gamit, Sirius e Ally. Os resultados obtidos neste trabalho evidenciam que os produtos Furadan, Ronstar, Goal, Facet e Gamit apresentam maiores riscos ambientais e cuidados devem ser adotados apos a aplicacao no sentido de evitar o deslocamento dos mesmos para fora das lavouras. Os herbicidas Ally e Sirius apresentam valores elevados de CL50, demonstrando baixa toxicidade para carpa. ACUTE TOXICITY OF HERBICIDES AND INSECTICIDES APPLIED IN WATER-SEEDED RICE TO JUVENILE CARP (Cyprinus carpio) Abstract The water-seeded rice culture presents great economical and social importance in the states of Santa Catarina and Rio Grande do Sul and stands out by the intense utilization of agro-chemicals, mainly herbicides and inseticides. Studies were carried out in laboratory to evaluate the acute toxicity of some agro-chemicals utilized in water seeded rice, aiming to establish the risk concentrations as well as positive effects wich the products may present in non-target organisms. The species used as indicator was common carp ( Cyprinus carpio), in function of its utilization in association of rice and fish. The herbicides Ally (Metsulfuron-methyl), Gamit (Clomazone), Goal (Oxyfluorfen), Ronstar (Oxadiazon) and Sirius (Pyrazosulfuron) and the insecticide Furadan (Carbofuran) were tested, individually, in variable concentrations. The results suggested large variation among chemicals in the toxicity to carp. The risk index, estimated dividing the CL50 by the estimated concentration found in the field considering the label rate, was 0,82; 2,76; 5,93; 8,87; 13,94; 4.000 and 7.878; respectively for Furadan, Ronstar, Goal, Facet, Gamit, Sirius and Ally. The results of this work shows evidences that the insecticide Furadan, and the herbicides Ronstar, Goal, Facet and Gamit present greater environmental risks and manners should be adopted after the application in the sense of avoiding the deslocation for outside plantations. The CL50 96 hours to carp for the herbicides Ally and Sirius is very high, showing low toxicity to Cyprinus carpio.

TOXICIDADE AGUDA DE HERBICIDAS E INSETICIDA UTILIZADOS NA CULTURA DO ARROZ IRRIGADO SOBRE JUVENIS DE CARPA ( Cyprinus carpio)