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Acaricidal activity of essential oil of lemongrass, chymbopogon citratus (DC.) STAPF against tetranychus urticae koch [electronic resource].

By:

Mead, Hala M. I

Language: English Summary language: Arabic Description: P.43-51Other title:

النشاط الابادي الأكاروسى للزيت العطري لحشيشة الليمون على الحلم العنكبوتى ذو البقعتين [Added title page title]

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Mansoura University journal of plant protection and pathology, 2012 v. 3 (1) [electronic resource].

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In: Mansoura University Journal of Plant Protection and Pathology 2012.v.3(1)Summary: The chemical constituents of the essential oil of lemongrass, Chymbopogon citratus that collected from Sharquia Governorate, Egypt, were determined by GCMS analysis. Geranial and neral were the basic constituents in the essential oil that recorded (48.692 and 34.137%, respectively). Moreover. the acaricid31 and repellent activity of the essential oil were evaluated against T. urticae under laboratory conditions. According to LC₅₀ and Lew, the lemongrass oil was more toxic against adults of T. urticae using spraying method than leaf dip technique method (direct feeding). Moreover. aii the tested concentrations of the essential oil significantly reduced hatchability percentages of T. urticae eggs than control, that recorded (85.33 ± 3.72, 77.33 ± 3.76, 57.33 ± 3.59 and 33.33 ± 3.01%) for (0.25, 0.50. 1.00 and 2.00 %. respectively). Control gave 96.00 ± 0.00%. Also, the higher used concentration of lemongrass oil, recorded the highest significant repellency percentages against adults of T. urlicae (79.96 ± 3.44%). While the lower one gave the least significant decrease (46.32 ± 2.61%).

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The chemical constituents of the essential oil of lemongrass, Chymbopogon citratus that collected from Sharquia Governorate, Egypt, were determined by GCMS analysis. Geranial and neral were the basic constituents in the essential oil that recorded (48.692 and 34.137%, respectively). Moreover. the acaricid31 and repellent activity of the essential oil were evaluated against T. urticae under laboratory conditions. According to LC₅₀ and Lew, the lemongrass oil was more toxic against adults of T. urticae using spraying method than leaf dip technique method (direct feeding). Moreover. aii the tested concentrations of the essential oil significantly reduced hatchability percentages of T. urticae eggs than control, that recorded (85.33 ± 3.72, 77.33 ± 3.76, 57.33 ± 3.59 and 33.33 ± 3.01%) for (0.25, 0.50. 1.00 and 2.00 %. respectively). Control gave 96.00 ± 0.00%. Also, the higher used concentration of lemongrass oil, recorded the highest significant repellency percentages against adults of T. urlicae (79.96 ± 3.44%). While the lower one gave the least significant decrease (46.32 ± 2.61%).

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