اثرات کشندگی و زیرکشندگی امامکتین بنزوات روی Tuta absoluta

Document Type : Research Paper

Authors

1 Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Department of Plant Protection, Faculty of Agriculture, Persian Gulf University, Bushehr, Iran.

Abstract

چکیده
 شب­ پره مینوز گوجه­ فرنگی،Tuta absoluta ، یکی از آفات مهم گوجه­ فرنگی در بسیاری از کشورها می­ باشد. حشره­ کش امامکتین­بنزوات به طور گسترده برای کنترل آفات بال پولکدار بکار برده می­شود ولی اطلاعات کمی درباره اثرات زیرکشندگی آن روی T. absoluta موجود است. در این مطالعه، اثرات کشندگی و زیرکشندگی امامکتین بنزوات روی T. absoluta تحت شرایط آزمایشگاهی بررسی شد. زیست­سنجی سمیت حاد روی لاروهای سن دوم T. absoluta با روش تماس با باقیمانده سم انجام شد. مقدار LC50  بدست آمده امامکتین بنزوات 50/14 میلی­ گرم ماده موثره بر لیتر پس از 24 ساعت در معرض قراردهی بود.  LC10و LC30 حشره­ کش برای بررسی اثرات زیرکشندگی استفاده شد. حشره­ کش به طور معنی ­دار طول دوره لاوری را در غلظت LC30 افزایش داد. وزن شفیرگی، باروری و طول عمر بالغین ماده­ها در هر دو غلظت زیرکشنده کاهش یافت. با این حال، در بررسی اثرات زیرکشندگی، LC10 و LC30 حشره ­کش اثر معنی ­داری روی طول دوره شفیرگی، درصد تفریخ تخم و طول عمر بالغین نر نداشتند. این نتایج نشان می­دهد که غلظت­های زیرکشنده امامکتین ­بنزوات می­ توانند با به تعویق انداختن دوره رشدی و کاهش تولیدمثل، اثرات منفی بر دینامیسم جمعیتT. absoluta  داشته باشند. بنابراین، این حشره­ کش زیستی در صورت ثابت شدن کارایی در شرایط مزرعه و گلخانه می­ تواند در برنامه ­های مدیریت تلفیقی علیه T. absoluta بکار رود.

Keywords


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