اثر حشره‌کشی نانو ذرات Zn-TiO2-Ag روی شته خرزهره Aphis nerii

محورهای موضوعی : گیاه پزشکی

محمد روحانی ¹ , محمد امین سمیع ²

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تاریخ دریافت : 1390/12/17 تاریخ پذیرش : 1391/12/26 تاریخ انتشار : 1390/03/01

کلید واژه: nanoparticles, ایمیداکلوپراید, Imidacloprid, نانو ذرات, حشره‌کشی, شته خرزهره, Aphis nerii, Insecticidal,

چکیده مقاله :

در سال‌های اخیر نانو ذرات جدید به‌خاطر ویژگی‌های الکتریکی، مکانیکی و شیمیایی آن‌ها که تفاوت‌ معنی‌داری با ذرات بالک آن‌ها دارد موضوع تحقیقات قرار گرفته است. پیشرفتدرعلوموفناورینانودردههگذشته،فرصتهایزیادیبرایبررسیاثراتبیولوژیکیازجملهاثراتحشره‌کشینانو ذراتایجادکردهاست. در این پژوهش نانو ذرات 70%Zn-28%TiO2-2%Ag و 70%Zn-29%TiO2-1%Ag به روش سولووترمال تهیه و اثر حشره‌کشی آن‌ها و آفت‌کش ایمیداکلوپراید روی شته خرزهره Aphis nerii (Hem: Aphididae) بررسی گردید. نتایج حاصل از میکروسکوپ الکترونی روبشی (SEM) نشان داد که نانو ذرات سنتز شده در این پژوهش دارای اندازه 48 -49 نانومتر می‌باشند. در این پژوهش مقدار LC50 برآورد شده برای 70%Zn-28%TiO2-2%Ag، 70%Zn-29%TiO2-1%Ag و ایمیداکلوپراید به ‌ترتیب74/476، 51/528 و 66/0 بود. نتایج این ثابت کرد که این نانو ذرات همانند ایمیداکلوپراید دارای کشندگی روی شته خرزهره هستند. همچنین نتایج این آزمایش نشان داد که ایمیداکلوپراید در غلظت 1 میکرولیتر بر میلی‌لیتر و نانو ذرات Zn-TiO2-Ag در غلظت 700 میلی‌گرم بر میلی‌لیتر بیشترین اثر کشندگی را داشتند.

چکیده انگلیسی:

In recent years noble metal nanoparticles have been the subjects of focused researches due to their unique electronic, mechanical and chemical properties that are significantly different from those of bulk materials. Improvements in nanotechnology in the past decayed has created various opportunities for evaluation of biologic effects such as insecticidal effects of nanoparticles. In this research, nanoparticles of 70%Zn-28%TiO2-2%Ag and 70%Zn-29%TiO2-1%Ag were synthesized through a solvothermal method and the insecticidal activity of Zn-TiO2-Ag nanoparticles and imidacloprid against the A.nerii was investigated. Results of Scanning Electron Microscopy (SEM) showed that these nanoparticles are approximately spherical with the diameter varying 48 and 49 nm, respectively. In this experiment, the LC50 value for 70%Zn-28%TiO2-2%Ag, 70%Zn-29%TiO2-1%Agand imidacloprid were calculated to be 476.74, 528.51 and 0.66, respectively. These results demonstrated that these nanoparticles have insecticidal effect on A. nerii. Additionally, the study showed that imidacloprid at 1 µl/ml and nanoparticles at 700 mg/ml had the highest insect mortality effect.

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