Title:	Insecticidal activity of aqueous extracts of plant origin on Mahanarva spectabilis (Distant, 1909) (Hemiptera: Cercopidae).
Authors:	NASCIMENTO, V. F. AUAD, A. M. RESENDE, T. T. de VISCONDE, A. J. M. DIAS, M. L.
Affiliation:	VINÍCIUS FERRAZ NASCIMENTO, Universidade Federal de Juiz de Fora; ALEXANDER MACHADO AUAD, CNPGL; TIAGO TEIXEIRA DE RESENDE, CNPGL; AMANDA JDENAINA MENDOZA VISCONDE, Centro Universitário UniAcademia; MARCELLE LEANDRO DIAS, Universidade Federal de Juiz de Fora.
Date Issued:	2022
Citation:	Agronomy, v. 12, n. 4, 947, 2022.
Description:	The spittlebug Mahanarva spectabilis (Distant, 1909) is considered the main and most limiting pest of elephant grass (Pennisetum purpureum Schum.), and has caused economic losses to Brazilian farmers. In this study, we evaluated the insecticidal effects of aqueous extracts of garlic, rue, cinnamon, lemongrass, clove, star anise, eucalyptus, tobacco, and thyme on M. spectabilis nymphs. The results indicated that the tobacco extract was the most effective among all extracts, as it reached a mortality of 76%. The next most effective was star anise extract and cinnamon extract was the least effective. In the second stage of tests, we evaluated the insecticidal potential of five concentrations of tobacco extract. The values of LD50 and LD90 calculated for aqueous tobacco extract were, respectively, 11.5% and 33.3% 24 h after application, and 9.2% and 29.5% 48 h after application. We also evaluated different methods of extraction, through comparative tests, and the methods of infusion and decoction proved to be equivalent to those of the method of extraction by ultrasound. We conclude that among the nine aqueous plant extracts tested, tobacco extract was the only one recommended against M. spectabilis, as it showed insecticidal activity, with better results at a concentration of 25%, and with extraction by infusion and decoction.
Thesagro:	Cigarrinha Praga de Planta Inseticida Mortalidade Extração
NAL Thesaurus:	Mortality Agroecology Botanical insecticides Pest control
Keywords:	Agroecologia Inseticida botanico Plant active ingredients Extraction methods
DOI:	https://doi.org/10.3390/agronomy12040947
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPGL)