Comparative toxicity of several botanical oils against the adults of Sitophilus oryzae.

Bioassay tests were carried out to evaluate the toxicity of garlic, jojoba, clove, mustard, camphor and ginger oils against the adults of Sitophilus oryzae (L.). The insecticidal activity of the oils was investigated for 14 days under 28±2°C. The results indicated that a variation in the toxicity of tested botanical oils against the adults of Sitophilus oryzae was found, according to their median lethal concentration (LC50) the toxicity order of these oils was garlic > jojoba > clove > mustard > camphor > ginger. The values of LC50 ranged between 0.150% and 2.194% (v/w) which were recorded after 7 days of the treatment. The least value of LC50 (0.045%) was obtained against the insect tested when garlic oil was applied on wheat grains for 14 days. [ABSTRACT FROM AUTHOR]