Efficacy of Some Plant Essential Oils Against
two Spotted Spider Mite &lt;i&gt;Tetranychus urticae&lt;/i&gt;
under Laboratory Conditions

The rice weevil Sitophilus oryzae is one of the primary insects that infest stored grains, causing both quantitative and qualitative losses. The use of synthetic pesticides to control it has led to the emergence of several problems related to human health and the environment, which has prompted the search for safer alternatives for their control. In this study, the effectiveness of two essential oils, cumin ( Cuminum cyminum ) and basil ( Ocimum basilicum ), was evaluated as insecticides for controlling the rice weevil at three different times intervals and various concentrations. (GC-MS) analysis revealed that both oils contain several key compounds, such as procanal (26.07%), ˠ- terpinene (15.78%), for C. cyminum and linalool (56.7%), cadinol, epi-α (11.4%) for O. basilicum , in addition to some secondary components. The results showed that, the lethal concentration (LC 50 ) of cumin was 49%, 45%, and 33% lower than that of basil at the 24, 48, and 72-h assessment periods, respectively demonstrating the superiority of cumin over basil. Regarding the effects on the levels of certain enzymes activity, the results indicated that both oils had a significant impact on the activity of both enzymes ALP and GOT, while there was no significant effect on (GOT), α-amylase, and acetylcholinesterase (AChE) compared to control. Based on the obtained results, it can be concluded that tested essential oils could be developed as a safe and effective alternatives for controlling rice weevil.

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Toxicity and enzymatic activity changes in rice weevil (Sitophilus oryzae) induced by basil (Ocimum basilicum) and cumin (Cuminum cyminum) essential oils

Omar,

Khalil,

Alomran

et al. 2024

Preprint

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Background The rice weevil Sitophilus oryzae is a common and severe pest of stored products that cause great losses of seeds. Application of essential oils from many plants is very important approach for pest control. Results In this study, the toxicity of two natural essential oils, cumin (Cuminum cyminum) and basil (Ocimum basilicum), was evaluated after three different exposure times at different doses. Gas chromatography/ mass spectrometry (GC-MS) showed that the major constituents of C. cyminum essential oil were procanal (26.07%) and ˠ- terpinene (15.78%), whereas linalool (56.7%), cadinol, epi-α (11.4%) were the major compounds in O. basilicum. Toxicity results showed that cumin essential oil was most effective with LC50 of 11.04, 8.51 and 6.61 mg/ml compared to 21.91, 15.59 and 9.94 mg/ml for basil essential oil after 24, 48 and 72 h of exposure. Additionally, the total protein content and enzymatic activity of glutamic oxaloacetic transaminase (GOT), Alkaline Phosphatase (ALP), α-amylase, and acetylcholinesterase (AChE) were measured. The results showed that the LC50 values of both tested essential oils had no significant effect on all tested enzymes, except for ALP and GOT. Conclusions cumin essential oil was most effective with LC50 of 11.04, 8.51 and 6.61 mg/ml so, it can be used to control rice weevil (Sitophilus oryzae).

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Efficacy of Some Plant Essential Oils Against two Spotted Spider Mite <i>Tetranychus urticae</i> under Laboratory Conditions

Cited by 3 publications

References 31 publications

Biological activities of novel 2-pyrazolin-5-one derivatives and their toxicity on certain pests infesting field crops in laboratory conditions

Biological activities of novel 2-pyrazolin-5-one derivatives and their toxicity on certain pests infesting field crops in laboratory conditions

Toxicity and enzymatic activity changes in rice weevil (Sitophilus oryzae) induced by basil (Ocimum basilicum) and cumin (Cuminum cyminum) essential oils

Toxicity and enzymatic activity changes in rice weevil (Sitophilus oryzae) induced by basil (Ocimum basilicum) and cumin (Cuminum cyminum) essential oils

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