Fumigant and repellent activities of different essential oils alone and combined against the maize weevil

CALVIMONTE, H.; ZYGADLO J. A.; ARENA, J. S.; ZYGADLO J. A.; ARENA, J. S.; PESCHIUTTA, MARÍA LAURA; PESCHIUTTA, MARÍA LAURA; CALVIMONTE, H.

MOJ BIOORGANIC & ORGANIC CHEMISTRY

MEDCRAVE GROUP LLC

Lugar: Edmond; Año: 2017 vol. 1 p. 1 - 6

2574-819X

The insecticidal and repellent activities of five essential oils (EOs) were studied separately and in binary combinations against Sitophilus zeamais. Minthostachys verticillata EO showed the highest fumigant activity with a LC50 value of 28.2 μl/l air. A moderate toxicity was observed with Eucalyptus globulus EO (LC50 = 335.7 μl/l air), whereas the EOs from Aloysia citriodora, Coriandrum sativum and Mentha sp. did not show insecticidal effect at 600 μl/l air. All combinations that include M. verticillata EO showed strong fumigant activity with LC50 values lesser than 78 μl/l air. The co-toxicity coefficient (CCT) of M. verticillata and E. globulus EO combination indicated an aditive effect (CTC = 119.1). Repellent activity was evaluated using two-choice olfactometer assay. All EOs and their combinations had repellent effect on adults of S. zeamais (P < 0.05).