de Melo BA, de Assis CAF, Ferreira SJ, Maceió SR

Language: Portugués
References: 14
Page: 419-428
PDF size: 162.46 Kb.

ABSTRACT

Introduction: we used the copaiba oil (Copaifera langsdorffii Desf.) in two application forms as an alternative control Tribolium castaneum.
Objective: the objective of this study was to evaluate the toxicity of copaiba oil (C. langsdorffii) on adults of T. castaneum.
Methods: bioassays were conducted in the Laboratory of Seed Analysis, Federal University of Campina Grande, Campina Grande, Paraíba, Brazil. There were two bioassays: (1) Mortality by Contact and (2) Nebulization. At first, the adults of T. castaneum were kept in acrylic containers (50 mL) with a lid having oil dilutions of 0.0 (control), 10, 30, 50, 70 and 90%, applying 0.5 mL of the dilution on a filter paper disc. In the second experiment, the insects were placed in plastic containers (100 mL) with lid, from which the oil was smuggled into these in the form of mist, at doses of 0.0 (control), 0.5, 1.0, 1.5, 2.0 and 2.5 mL. For the two experiments evaluated, the number of dead insects after 24, 48 and 72 hours as well as LD₅₀ and LD₉₀. Bioassays were organized into 6 x 3 factorial arrangement.
Results: in both experiments, the copaiba oil proved being effective for the control of T. castaneum, with mortality rates of up to 100% due to 97.5% by nebulization.
Conclusion: the oil of C. langsdorffii, by contact or misting, is toxic to T. castaneum.

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