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- Title
Bioactivity of Some Essential Oils against the Rice Weevil, Sitophilus oryzae L. (Coleoptera: Curculionidae).
- Authors
Ibrahim, Sahar I. A.
- Abstract
Efficacy of four extracted plant oils from Juniper (Juniperus communis), Marjoram (Origionum majorana), Mustard (Brassica rapa) and Onion (Allium cepa) were tested against adults of the rice weevil Sitophilus oryzae L. (Coleoptera: Curculionidae). Toxicity, adult emergency and repellency rates were studied. Results showed that mustard and marjoram oils were more toxic against S. oryzae adults with LC50 values of 6.2 and 6.5% than juniper and onion oils (LC50 of 8.8 and 9.3%) at one day after treatment. The oils had the same trend at one week post treatment. Marjoram oil was more toxic against S. oryzae adults at concentration of 5%. Reduction percentage in F1 was 83% at the concentration 5% of marjoram. Repellent effect of the tested oils decreased with decreasing the concentration and increasing time. Marjoram oil had the most repellent effect on the tested pest as it gave repellency of 100% a t 5% concentration after 4 hrs. Percentage of grains weight loss as a result of oil treatments exhibited significant differences between control and all treatments at most of the concentrations. Tested oils showed relative grain protecting activity against the rice weevil and could be included in integrated pest management (IPM) programs.
- Subjects
ESSENTIAL oils; PLANT extracts; JUNIPERS; RICE weevil; PEST control
- Publication
Egyptian Journal of Biological Pest Control, 2016, Vol 26, Issue 1, p123
- ISSN
1110-1768
- Publication type
Article