| Autor: |
Costa ÂCF; Programa de Pós-Graduação em Agricultura e Biodiversidade, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Cavalcanti SCH; Departamento de Farmácia, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Santana AS; Programa de Pós-Graduação em Agricultura e Biodiversidade, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Lima APS; Programa de Pós-Graduação em Agricultura e Biodiversidade, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Brito TB; Departamento de Farmácia, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Oliveira RRB; Departamento de Farmácia, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Macêdo NA; Departamento de Farmácia, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Cristaldo PF; Programa de Pós-Graduação em Entomologia Agrícola, Departamento de Agronomia, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil., Araújo APA; Departamento de Ecologia, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil., Bacci L; Programa de Pós-Graduação em Agricultura e Biodiversidade, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil. bacci.ufs@gmail.com.; Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil. bacci.ufs@gmail.com. |
| Abstrakt: |
The diamondback moth Plutella xylostella (Linnaeus, 1758) (Lepidoptera: Plutellidae) is a destructive pest of brassica crops of economic importance that have resistance to a range of insecticides. Indole derivates can exert diverse biological activities, and different effects may be obtained from small differences in their molecular structures. Indole is the parent substance of a large number of synthetic and natural compounds, such as plant and animal hormones. In the present study, we evaluate the insecticidal activity of 20 new synthesized indole derivatives against P. xylostella, and the selectivity of these derivatives against non-target hymenopteran beneficial arthropods: the pollinator Apis mellifera (Linnaeus, 1758) (Hymenoptera: Apidae), and the predators Polybia scutellaris (White, 1841), Polybia sericea (Olivier, 1791) and Polybia rejecta (Fabricius, 1798) (Hymenoptera: Vespidae). Bioassays were performed in the laboratory to determine the lethal and sublethal effects of the compounds on P. xylostella and to examine their selectivity to non-target organisms by topical application and foliar contact. The treatments consisted of two synthesized derivatives (most and least toxic), the positive control (deltamethrin) and the negative control (solvent). The synthesized compound 4e [1-(1H-indol-3-yl)hexan-1-one] showed high toxicity (via topical application and ingestion) and decreased the leaf consumption by P. xylostella, displaying a higher efficiency than the pyrethroid deltamethrin, widely used to control this pest. In addition, the synthesized indole derivatives were selective to the pollinator A. mellifera and the predators P. scutellaris, P. sericea and P. rejecta, none of which were affected by deltamethrin. Our results highlight the promising potential of the synthesized indole derivatives for the generation of new chemical compounds for P. xylostella management. |
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