Effectiveness of some plant oils and Malathon 1% dust against the coleopteran beetles the rice weevil Sitophilus oryzae(L). and the granary weevil Sitophilus granarius.

The present study aimed to evaluate the toxic effects of four natural plant oils a.i.e. Thyme oil (Thymus vulgaris), Lemon grass oil (Cymbopogn citratus), Pulicaria oil (Pulicaria adenensis) and Chamomile flower oil (Matricaria chamomilla) against the adults of Sitophilus oryzae(L.) and Sitophilus granarius at the laboratory conditions. Mortality and reduction in if F1 -progeny were assessed. Results showed high mortality values at various used concentration after 3 and 7 days from initial treatment. The S. oryzae showed moderately sensitive than S. granarius. Also , the inhibition in F1-progeny at all oils had lower than the mortality. Toxicity of Malathion against S.oryzae and S. granarius were fast acting. For both insects, control mortality was extremely high and achieved 100% after 2 days only and 3 days for S. oryzae and S. granrius, respect respectively. The results suggested that these essential oils canbe used as appropriate alternative strategy for control the S.oryzae and S. granarius.