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

Madson Ralide Fonseca Gomes; Gilcéia Guadagnin Dorneles; Roselena Silvestri Schuh; Ana Laura  Bemvenuti Jacques; Lúcia Rosane  Bertholdo-Vargas; Sérgio Augusto Loreto Bordignon; Renata Pereira Limberger

Madson Ralide Fonseca Gomes
Gilcéia Guadagnin Dorneles
Roselena Silvestri Schuh
Ana Laura Bemvenuti Jacques
Lúcia Rosane Bertholdo-Vargas
Sérgio Augusto Loreto Bordignon
Renata Pereira Limberger

Keywords: Monoterpenoids. Sesquiterpenoids. Drimys angustifolia. Drimys brasiliensis. Cryptotermes brevis.

Abstract

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.