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Santos NC, Silva JED, Santos ACC, Dantas JDO, Tavares SRSA, Andrade VS, Oliveira SDDS, Blank AF, Araújo APA, Bacci L. Bioactivity of essential oils from Croton grewioides and its major compounds: toxicity to soybean looper Chrysodeixis includens and selectivity to the predatory stink bug Podisus nigrispinus. Environ Sci Pollut Res Int 2023; 30:18798-18809. [PMID: 36217049 DOI: 10.1007/s11356-022-23414-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 09/28/2022] [Indexed: 06/16/2023]
Abstract
Natural biological control is a key factor that ensures the regulation of insect pest populations in agroecosystems. However, the indiscriminate use of pesticides has compromised this environmental service. Thus, the search for environmentally safe pesticides is an increasing requirement for sustainable food production. In this study, we analyzed the toxicity of essential oils from two accessions (CGR112 and CGR126) of Croton grewioides and its major compounds, methyl eugenol and eugenol, on the soybean pest Chrysodeixis includens. In addition, we investigated the sublethal effects of these compounds on the predatory bug Podisus nigrispinus, analyzing its developmental, reproduction and life table parameters. Essential oils and their major compounds were toxic to C. includens and P. nigrispinus. In general, the presence of eugenol made the essential oil more toxic to the pest and selective to the natural enemy. Eugenol was the most toxic compound for 2nd instar larvae of C. includens at LD50, followed by CGR126 essential oil from C. grewioides which was equally toxic at higher doses. The estimated lethal times for essential oils to cause mortality in 50% of the population of C. includens were less than 15 h. There was selectivity of the essential oil of CGR126 accession of C. grewioides at lethal doses above 90%. Although the treatments showed little effect on the development of P. nigrispinus, body mass and reproductive parameters were negatively affected, with the exception of the essential oil of CGR126 accession of C. grewioides. The essential oil of C. grewioides may be a promising active ingredient for the synthesis of new insecticides, which are efficient against C. includens and at the same time are safer for the natural enemy P. nigrispinus.
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Affiliation(s)
- Natielli Conceição Santos
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil
| | - Jefferson Elias da Silva
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil
| | - Ane Caroline Celestino Santos
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil
| | - Jaciele de Oliveira Dantas
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil
| | | | - Valfran Silva Andrade
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil
| | - Sara Dayan da Silva Oliveira
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil
| | - Arie Fitzgerald Blank
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil
| | | | - Leandro Bacci
- Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, Av. Marechal Rondon s/n, São Cristóvão, SE, 49100-000, Brazil.
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