-The control of Spodoptera frugiperda (J. E. SMITH) (Lepidoptera: Noctuidae) has been carried out mainly with pyrethroids and organophosphates insecticides. The continuous and indiscriminate use of synthetic insecticides, for decades, has led to the selection of resistant populations and has caused concerns for human health and the environment. An alternative is the use of botanical insecticides, including through the mixtures with synthetic insecticides. This study aimed to investigate the toxicity of copaiba oil-resin mixtures (COR) with deltamethrin, beta-cyfluthrin, beta-cypermethrin, methomyl, triazophos and chlorpyrifos for S. frugiperda. Bioassays were performed in the laboratory using newly hatched caterpillars on a contaminated surface (filter paper). Initially, concentration-mortality curves were established for each insecticide and COR. Based on the results, experiments were conducted to verify the effect of the COR mixtures with synthetic insecticides in the proportions of 1:1 (LC 25 + LC 25 ) on larvae of S. frugiperda. Additionally, COR concentration-response curves were established by adding 1/8 of the recommended rate of each insecticide. Notably, the use of this concentration for all insecticides was previously determined in bioassays, and no significant toxicity was found for S. frugiperda caterpillars. It was found that the toxicity of COR increased substantially by adding synthetic insecticides, especially with lower mixtures with beta-cypermethrin, methomyl and triazophos.Keywords: Bioinsecticide. Additive effect. Synergism. Corn plague. Integrated pest management. POTENCIALIZAÇÃO DO ÓLEO-RESINA DE COPAÍBA COM INSETICIDAS SINTÉTICOS PARAO CONTROLE DA LAGARTA-DO-CARTUCHO RESUMO -O controle de Spodoptera frugiperda (J. E. SMITH) (Lepidoptera: Noctuidae) tem sido realizado principalmente com inseticidas piretróides e organofosforados. O uso contínuo e indiscriminados de inseticidas sintéticos, durante décadas, tem ocasionado a seleção de populações resistentes, bem como preocupações em relação à saúde humana e ao meio ambiente. Uma alternativa é o emprego de inseticidas botânicos, inclusive por meio de misturas com inseticidas sintéticos. Assim, este trabalho teve por objetivo investigar a toxicidade de misturas do óleo-resina de copaíba (ORC) com os inseticidas deltametrina, beta-ciflutrina, beta-cipermetrina, metomil, triazofós e clorpirifós para S. frugiperda. Foram realizados bioensaios em laboratório utilizando-se lagartas recém-eclodidas em superfície contaminada (papel filtro). Inicialmente, foram estabelecidas curvas de concentração-mortalidade para cada inseticida e para o COR. A partir dos resultados obtidos foram realizados bioensaios para verificar o efeito das misturas do ORC com os inseticidas sintéticos nas proporções de 1:1 (CL 25 + CL 25 ) sobre lagartas de S. frugiperda. Adicionalmente, foram estabelecidas curvas de concentração-resposta do ORC adicionando-se 1/8 da dose comercial de cada inseticida. Vale destacar que o uso desta fração para todos os inseticidas foi d...
Bean (Phaseolus vulgaris L.) cultivation has great agricultural and food importance, but this crop production is generally affected by severe infestations of Cerotoma arcuata (Olivier) (Coleoptera: Chrysomelidae) in the northern region of Brazil. An alternative for leaf beetle control is the use of physiological insecticides acting in the initial phase of plant growth, through pre-sowing seed treatment. In this sense, this study aimed to evaluate the effects of systemic insecticides, based on thiamethoxam, imidacloprid and fipronil, on the germination performance of bean seeds, and to verify the efficacy of these insecticides on the control of C. arcuata. The research was carried out in two stages. Initially, under laboratory conditions, the influence of the insecticides on the germinating power of seeds was evaluated through the following parameters: germination, emergence, electrical conductivity and dry mass of the aerial part. In the field, the efficacy of the insecticides on the plant stand, number of insects per plant and level of foliar damage at 21 and 28 days of planting were evaluated. The insecticides investigated did not affect the germinating power of seeds when compared to the control. Regarding field results, there was a lower incidence of C. arcuata and less leaf damage to plants from seeds treated with systemic insecticides, showing greater crop protection in the period studied.
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