Determination of sub-lethal effects of spirotetramat and chlorpyrifos on Aenasius bambawalei Hayat (Hymenoptera: Encyrtidae) by using life table

Document Type : Research Paper


1 Department of Plant Protection, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan, I. R. Iran

2 Department of Plant Protection, Faculty of Agriculture and Natural resources, Persian Gulf University, Bushehr, I. R. Iran



Compatibility of pesticides and biological control agents is the main concern of Integrated Pest Management (IPM) programs. The present study focused on the side effects of spirotetramat and chlorpyrifos on the demographic parameters of Aenasius bambawalei Hayat (Hym: Encyrtidae). Adult parasitoids were exposed to one ppm of chlorpyrifos and 7.5 ppm of spirotetramat for 24 hours. Then, they were released on the third instar nymphs of the mealybug Phenacoccus solenopsis Tinsley (Hem. Pseudococcidae) and their demography was investigated. The results showed that oviposition period, fecundity, and female and male longevities adversely were affected by both insecticides. However, the adult pre-oviposition period (APOP), the total pre-oviposition period (TPOP), and the number of daily eggs of insect females were not affected significantly. The intrinsic rate of increase (r) was calculated to be 0.16, 0.13, and 0.12 day-1 for control, spirotetramat, and chlorpyrifos treatments, respectively. The results of this study revealed that chlorpyrifos at sublethal concentrations have more negative effects on A. bamabawalei than spirotetramat and need to be applied with caution in IPM programs.


Article Title [Persian]

تعیین اثرات زیرکشندگی اسپیروتترامات و کلرپایریفوس رویAenasius bambawalei Hayat (Hymenoptera: Encyrtidae) با استفاده از جدول زندگی

Authors [Persian]

  • سعیده هادیان 1
  • نوشین زندی سوهانی 1
  • فاطمه یاراحمدی 1
  • فریبا سهرابی 2
1 گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان ، ملاثانی، ج.ا. ایران
2 گروه گیاهپزشکی، دانشکده کشاورزی و منابع طبیعی، دانشگاه خلیج فارس، بوشهر، ج.ا. ایران
Abstract [Persian]

در برنامه های مدیریت تلفیقی آفات، سازگاری بین آفت­کشهای مورد استفاده و عوامل کنترل بیولوژیک بسیار مهم است. در پژوهش حاضر اثرات زیرکشندگی اسپیروتترامات و کلرپیروفوس روی پارامترهای رشد جمعیت Aenasius bambawalei Hayat (Hym: Encyrtidae) مورد بررسی قرار گرفت. حشرات کامل پارازیتوئید به مدت 24 ساعت در معرض دوز  یک قسمت در میلیون(ppm)  کلرپایریفوس و 7/5 ppm  اسپیروتترامات قرار گرفتند. پس از این مدت، حشرات روی پوره های سن سوم شپشک Phenacoccus solenopsis Tinsley (Hem. Pseudococcidae) رهاسازی شدند و خصوصیات رشد جمعیت آنها مورد بررسی قرار گرفت. نتایج نشان داد که طول دوره تخم گذاری، باروری و طول عمر حشرات نر و ماده توسط هر دو حشره کش تحت تاثیر قرار گرفت. هرچند، طول دوره پیش از تخمگذاری بالغین (APOP) و کل دوره پیش از تخمگذاری (TPOP) و تعداد تخم روزانه ماده­ها تحت تاثیر حشره­کش­ها تغییر معنی داری نشان نداد. نرخ ذاتی رشد جمعیت (r) ، در تیمارهای شاهد، اسپیروتترامات و کلرپایریفوس به ترتیب 0/16، 0/13و 0/12 در روز محاسبه گردید. نتایج این بررسی نشان داد که کلرپایریفوس در غلظت­های زیرکشنده، در مقایسه با اسپیروتترامات اثرات منفی بیشتری روی A. bamabawalei داشت و لازم است در برنامه های مدیریت تلفیقی آفات با احتیاط بیشتری مورد استفاده قرار گیرد.

Keywords [Persian]

  • اثرات زیرکشندگی
  • جمعیت شناسی
  • زیست‌شناسی
  • غلظت زیرکشنده
  • کنترل بیولوژیکی
  • مدیریت تلفیقی آفات
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