Repellent Efficiency of Eucalyptus Essential Oil againstMaize Weevil Sitophilus zeamais (Motschulsky)

Abstract

objective of this study was to test the repellent efficiency of the eucalyptus essential oil (Eucalyptus camaldulensis) at concentrations 7, 8, 9, 10, 11, 12 and 13 percent dissolved in acetone 1 ml against maize weevil (Sitophilus zeamaisMotschulsky)using alternative test in the repellent tube (2 cm in diameter, 40 cm long) with rice seeds then recorded at 2, 4, 6, 8, 10, 12 และ 24 hours. The result found that the repellent efficiency of eucalyptus essential oil at the concentrations of 7 and 8 percent was ranged from 82.5 - 95.0 percent classified to the level 5 (80.1 - 100.0 percent) of insect repellent percent at 6 to 24 hours after application. The concentrations increased to 9 - 13 percent could repel maize weevil ranged from 89.6 - 100.0 percent from 2 to 24 hours and not a significant difference