Chemical composition of essential oils of Drimys angustifolia Miers and Drimys brasiliensis Miers and their repellency to drywood termite Cryptotermes brevis (Isoptera: Kalotermitidae)

• Published in: Revista de ciências farmacêuticas básica e aplicada Vol. 35; no. 1; pp. 41 - 46
• Main Authors: Madson Ralide Fonseca Gomes, Gilcéia Guadagnin Dorneles, Roselena Silvestri Schuh, Ana Laura Bemvenuti Jacques, Lúcia Rosane Bertholdo-Vargas, Sérgio Augusto de Loreto Bordignon, Renata Pereira Limberger
• Format: Journal Article
• Language: English
• Published: São Paulo State University (UNESP) 01.01.2014
• Subjects: Cryptotermes brevis; Drimys angustifolia; Drimys brasiliensis; Monoterpenoids; Sesquiterpenoids
• ISSN: 1808-4532; 2179-443X

The essential oils extracted from leaves of the Southern Brazilian native species Drimys angustifolia Miers (DA) and Drimys brasiliensis Miers (DB) by Clevenger distillation were analyzed by gas chromatography/ mass spectrometry (GC/MS). The oils of DA and DB consisted predominantly of monoterpenoids and sesquiterpenoids. The largest components of DA oil were bicyclogermacrene (19.6%), sabinene (9.7%) and myrcene (5.2%), while DB oil was characterized by cyclocolorenone (18.2%), followed by terpinen-4- ol (8.7%) and alpha-gurjunene (6.9%). Laboratory tests were carried out to determine the repellency of the essential oils to the drywood termite Cryptotermes brevis (Isoptera: Kalotermitidae). It was observed that the oil showed repellency at the concentrations 25, 12.5, and 6.25 μg/mL. The oils of both species exhibited a negative repellency index, which represents repellent activity, except for DA oil at the highest concentration, which was attractive. Five deaths (11% of the termite sample) were observed at 25 μg/mL DA, in the fourhour repellency test, while four deaths occurred at 12.5 μg/mL (approximately 9%). The essential oil of DB did not cause any termite deaths.