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Evaluation of the Insecticidal Activities of Three Eucalyptus Species Cultivated in Iran, Against Hyphantria Cunea Drury (Lepidoptera: Arctiidae)

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Ebadollahi A., Rahimi-Nasrabadi M., Batooli H., Geranmayeh J.
Journal of Plant Protection Research
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2013
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tom 53
|
nr 4
In the current study, the larvicidal activity of leaf essential oils from three eucalyptus species (Eucalyptus largiflorens Meull, Eucalyptus oleosa Meull, and Eucalyptus spathulata Hook) against American white moth, Hyphantria cunea Drury 1773 (Lepidoptera: Arctiidae), was investigated. Mortality was recorded daily for three days after treatment. Leaf disc bioassays revealed that all three oils had strong insecticidal activity on the experimental insects insofar as 50% lethal concentrations (LC50) for E. oleosa, E. spathulata, and E. largiflorens at 24 h exposure time were 0.36, 0.61, and 1.24%, respectively. The time needed to kill 50% (LT50) values were calculated as 9.09 h with E. largiflorens, 11.03 h with E. oleosa, and 13.03 h with E. spathulata at the highest concentrations (2.5% for E. largiflorens, 2% for E. oleosa, and 2.5% for E. spathulata). Based on probit analysis, an increase in the susceptibility of the insect was associated with an increase in the different concentrations of all oils and the increase in the time of exposure. The results of this study show that leaf essential oils of E. largiflorens, E. oleosa, and E. spathulata might be considered as a potent source for the production of fine natural larvicides.
2

Fumigant toxicity of Lavandula stoechas L. oil against three insect pests attacking stored products

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Ebadollahi A., Safaralizadeh M. H., Pourmirza A. A.
Journal of Plant Protection Research
|
2010
|
tom 50
|
nr 1
56-60
Plant secondary metabolites play an important role in plant-insect interactions and therefore such compounds may have insecticidal activity against insects. The chemical composition of the essential oil from leaves and flowers of Lavandula stoechas grown in Kashan, Iran, was studied by gas chromatography mass spectrometry (GC-MS). 1,8-Cineole (7.02%), γ-Cadinene (5.33%), T-Cadinol (5.07%), p-Mentha-1-en-8-ol (5.02%) and Caryophyllene (5.01%) were found to be the major constituents of the oil. In fumigant toxicity tests with the essential oil against adults of Tribolium castaneum Herbst, Lasioderma serricorne F. and Rhyzopertha dominica F. at 27±1°C and 60±5% RH, it was observed that L. serricorne (LC50 = 3.835 μl/l) were significantly more susceptible than R. dominica (LC50 = 5.66 μl/l) and T. castaneum (LC50 = 39.685 μl/l) 24 h after treatment. In all cases, considerable differences in mortality of insects to essential oil vapor were observed with different concentrations and times. Mortality increased as the doses of essential oils and exposure period increased and after 72 h fumigations, greatest percentages of mortality were obtained. The findings indicate the strong insecticidal activity of L. stoechas oil and it may be used in grain storage against insects L. serricorne, R. dominica and T. castaneum.
3

Toxicity of essential oil of Agastache foeniculum [Pursh] Kuntze to Oryzaephilus surinamensis L. and Lasioderma serricorne F.

100%
Ebadollahi A., Safaralizadeh M. H., Pourmirza A. A., Gheibi S. A.
Journal of Plant Protection Research
|
2010
|
tom 50
|
nr 2
215-219
The essential oil of aerial parts of Agastache foeniculum (Lamiaceae) was isolated by hydrodistillation method and constituents of oil were analyzed by gas chromatography mass spectrometry (GC-MS) method. Methyl chavicol, 1,8-cineole, 1-octen-3-ol, 3-octanone and germacrene D the predominant components of oil. Methyl chavicol (94.003%) was identified as a major component in the oil. Essential oil was tested for toxicity against adults of Oryzaephilus surinamensis L. and Lasioderma serricorne F. The influence of different concentrations of the essential oil vapours on adult mortality was significant. Data of probit analysis showed that a lethal concentration of the essential oil to kill 50% of the population (LC50) for adults of O. surinamensis and L. serricorne were 18.781 and 21.565 μl/l respectively. O. surinamensis was more susceptible than L. serricorne at the exposure time 24 h. The results demonstrated that mortality increased with the increase in concentration and exposure time. These results showed that the essential oil from A. foeniculum could be applicable the management of population of stored-product beetle pest.
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