Rhyzopertha do minica (Fabricius) (Coleoptera: Bostrichidae) Efficiency of Essential Oil from Marigold for Controlling Rhyzopertha dominica (Fabricius)

Abstract

The efficiency of essential oil of marigold (Tagetes erecta L.) obtalned by hot steam distillation
method as repellent, fumigant and contact toxicant was tested on 7 days old of lesser grain borer,
Rhyzopertha dominica (Fabricius). The treatments at various concentrations of essential oils 0, 10, 20, 30,
40 and 50 μL/Lair were applied. The treatments were arranged in a completely randomized design (CRD).
The experiment was conducted in biological laboratory. The result found that the essential oil from marigold
as repellent, fumigant and contact toxiant on lesser grain borer was significantly effective high (P<0.05)
when compared with the control (ethanol). At concentration of 50 μL/Lair of marigold essential oil was
effective as repellent against lesser grain borer with percentage repellency of 92.0 and 100% at 12 and
24 hrs, respectively. Besides, at concentration of 50 μL/Lair of marigold essential oil was effective as
fumigant toxicity and contact toxicity with median lethal concentration (LC50) values of 25.0 and 38.45 μL/
Lairafter 24 hrs, respectively.