In vitro activity of essential oils of Lippia sidoides and Lippia gracilis and their major chemical components against Thielaviopsis paradoxa, causal agent of stem bleeding in coconut palms

• Main Authors: Rejane Rodrigues da Costa e Carvalho, Delson Laranjeira, José Luiz Sandes de Carvalho Filho, Paulo Estevão de Souza, Arie Fitzgerald Blank, Péricles Barreto Alves, Hugo Cesar Ramos de Jesus, Dulce Regina Nunes Warwick
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2013-01-01
• Series: Química Nova
• Subjects: coconut; Lippia; Thielaviopsis paradoxa
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000200007&lng=en&tlng=en
• ISSN: 1678-7064

Essential oils of Lippia sidoides, Lippia gracilis and their main chemical components were investigated for in vitro control of Thielaviopsis paradoxa. Mycelial growth and a number of pathogen conidia were inhibited by the essential oil of L. sidoides at all concentrations tested (0.2; 0.5; 1.0; 3.0 µL mL-1). L. sidoides oil contained 42.33% thymol and 4.56% carvacrol, while L. gracilis oil contained 10% thymol and 41.7% carvacrol. Mycelial growth and conidial production of T. paradoxa were completely inhibited by thymol at a 0.3 µL m-1 concentration. The results suggest that thymol could potentially be used for controlling coconut stem bleeding.