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THE EFFECT OF CONSTANT TEMPERATURES ON SOME BIOLOGICAL PARAMETERS OF THE PARASITOID, ENCYRTUS AURANTII (GEOFFROY) (HYMENOPTERA:ENCYRTIDAE) IN LABORATORY

تأثير درجات الحرارة الثابتة في بعض المؤشرات الحياتية للمتطفل Encyrtus aurantii (Geoffroy) (Hymenoptera: Encyrtidae) مخبرياً.

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 Publication date 2013
and research's language is العربية
 Created by Shamra Editor




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Some biological parameters of the parasitoid, Encyrtus aurantii (Geoffroy) (Hymenoptera : Encyrtidae) were studied under controlled laboratory conditions at five levels of temperature 18, 21, 24, 27, and 30 °C, 65±5% R.H. and a photoperiod of 16:8 (L:D) h when reared on Brown soft scale Coccus hesperidum L. (Homoptera: Coccidae) reared on Pumpkin Cucurbita moschata during the season 2010- 2011 . Result showed that the longer developmental period from egg to pupa was on 18 °C with an average of 24.25 days, and the lower developmental period was on 30°C with an average of 8.25 days. The longer developmental period from pupa to adult was on 18 °C with an average of 10.75 days, and the lower period was on 30 °C with an average of 5.5 days. The lower developmental threshold (LDT) from egg to pupa was 15.83°C, and 14.34°C from pupa to adult. E. aurantii required a Sum of Effective Temperatures (SET) of 122.74 degree-days above the lower developmental threshold (16.95 °C) to complete the development from egg to adult.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة تأثير درجات الحرارة الثابتة على بعض المؤشرات الحياتية للمتطفل Encyrtus aurantii (Geoffroy) (Hymenoptera: Encyrtidae) في ظروف مخبرية. تم إجراء التجارب على خمس درجات حرارة مختلفة (18، 21، 24، 27، 30 درجة مئوية) ورطوبة نسبية 65±5% وفترة إضاءة (16:8) ساعة (ظلام: إضاءة). أظهرت النتائج أن أطول فترة لتطور البيضة إلى العذراء كانت عند درجة حرارة 18 مئوية بمتوسط 24.25 يوماً، وأقصر فترة كانت عند درجة حرارة 30 مئوية بمتوسط 8.25 يوماً. كما كانت أطول فترة لتطور العذراء إلى الحشرة الكاملة عند درجة حرارة 18 مئوية بمتوسط 10.75 يوماً، وأقصر فترة عند درجة حرارة 30 مئوية بمتوسط 5.5 يوماً. تم حساب العتبة الحرارية الدنيا (LDT) من البيضة إلى العذراء بـ 15.83 درجة مئوية، ومن العذراء إلى الحشرة الكاملة بـ 13.43 درجة مئوية، وللجيل الكامل بـ 16.95 درجة مئوية. يحتاج المتطفل إلى مجموع درجات حرارة فعالة (SET) 122.74 درجة-يومية فوق العتبة الحرارية الدنيا لإتمام جيل واحد (من البيضة إلى البالغة).
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال المكافحة الحيوية، حيث تقدم معلومات قيمة حول تأثير درجات الحرارة على تطور المتطفل Encyrtus aurantii. ومع ذلك، يمكن توجيه بعض النقد البنّاء لتحسين الدراسة. أولاً، لم يتم تناول تأثير العوامل البيئية الأخرى مثل الرطوبة النسبية بشكل كافٍ، والتي قد تؤثر أيضاً على تطور المتطفل. ثانياً، كان من الممكن توسيع الدراسة لتشمل تجارب ميدانية للتحقق من النتائج المخبرية في ظروف طبيعية. أخيراً، لم يتم مناقشة تأثير درجات الحرارة المختلفة على سلوك المتطفل وقدرته على التحكم في أعداد الحشرات القشرية في البيئة الطبيعية.
Questions related to the research
  1. ما هي أطول فترة لتطور البيضة إلى العذراء للمتطفل Encyrtus aurantii؟

    أطول فترة لتطور البيضة إلى العذراء كانت عند درجة حرارة 18 مئوية بمتوسط 24.25 يوماً.

  2. ما هي العتبة الحرارية الدنيا لتطور الجيل الكامل للمتطفل؟

    العتبة الحرارية الدنيا لتطور الجيل الكامل للمتطفل هي 16.95 درجة مئوية.

  3. كم تحتاج الحشرة من مجموع درجات حرارة فعالة لإتمام جيل واحد؟

    يحتاج المتطفل إلى مجموع درجات حرارة فعالة (SET) 122.74 درجة-يومية فوق العتبة الحرارية الدنيا لإتمام جيل واحد.

  4. ما هي أقل فترة لتطور العذراء إلى الحشرة الكاملة؟

    أقل فترة لتطور العذراء إلى الحشرة الكاملة كانت عند درجة حرارة 30 مئوية بمتوسط 5.5 يوماً.


References used
Abd-Rabou, Sh. Key to the genera of Encyrtidae from Egypt (Hymenoptera : Chalcidoidae : Encyrtidae). Egypt. J. Agric. Res., 79(1), 2001, 79-87
Abd-Rabou, S. Scale insects and their management in Egypt. Agric. Res. In Egypt Vol. 4 (1), 2003, 1- 63
Abd-Rabou, Sh.;. Refaat, M.H and Shalaby, H.H. MOLECULAR MARKERS DISTINGUISHING ENCYRTID. J. Agric. Sci. Mansoura Univ., 34 (12) ,2009,11421 - 11428
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