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Resumo- Formulacoes a base de terra de diatomacea (Keepdry ® e Insecto ® ) encontram-se disponiveis comercialmente no Brasil e algumas caracteristicas fisicas destas podem afetar a sua toxicidade e eficacia agronomica. Dessa forma, o objetivo deste estudo foi avaliar, com base em dados toxicologicos, a eficacia dessas duas formulacoes comerciais registradas e disponiveis no mercado brasileiro para o controle de Sitophilus zeamais Mots. (Coleoptera: Curculionidae) em milho armazenado. As CL 50 e CL 90 estimadas foram, respectivamente, de 248,75 e 360,18 ppm para Keepdry ® e de 204,57 e 409,97 ppm para Insecto ® , sem, contudo, haver diferenca significativa entre as formulacoes. Os tempos letais medios (TL 50 ) estimados tambem nao evidenciaram diferenca entre as duas formulacoes, em nenhuma das concentracoes avaliadas. Dessa forma, as duas formulacoes podem se constituir em alternativas promissoras para o manejo preventivo desse coleoptero-praga em cereais armazenados. Abstract – Diatomaceous earth-based formulations (Keepdry ® e Insecto ® ) are commercially available in Brazil and their physical characteristics can affect their toxicity and agronomic effectiveness. Thus, the aim of this study was to evaluate, based on toxicological data, the effectiveness of these commercial formulations registered and available in the Brazil market for the control of S. zeamais in stored corn. The LC 50 and LC 90 were estimated, respectively, in 248.75 and 360.18 ppm to Keepdry ® and in 204.57 and 409.97 ppm to Insecto ® without, however, occur significant difference among them. The mean lethal time (LT 50 ) estimated also showed no difference between the two formulations in any of the tested concentrations. Thus, the two formulations may constitute promising alternatives for the preventative management of this Coleoptera pest in stored grain.

Avaliação da eficácia de duas formulações comerciais de terra de diatomácea no controle do gorgulho-do-milho com base em parâmetros toxicológicos