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Isolation of local Bacillus spp. Strains and Testing its Efficiency Against Wax Worm Galleria mellonella L. Larvae in Laboratory

عزل سلالات محلية من بكتيريا .Bacillus spp و اختبار فاعليتها ضد يرقات فراشة الشمع الكبيرة .Galleria mellonella L مخبرياً

1093   1   10   0.0 ( 0 )
 Publication date 2018
  fields Plant Protecion
and research's language is العربية
 Created by Shamra Editor




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This study was carried out to determine the efficiency of local Bacillus isolates to control large wax moth larvae (Galleria mellonella L.) at GCSAR laboratory in 2012. Infected larvae were collected from stored wax combs, and the bacteria Bacillus genus were isolated from dead larvae, or that showing disease symptoms of black brown spots on larvae cuticle. Bacterium was grown on T3 medium and identified according to biochemical tests, and the efficacy of isolates was determined on pure colonies of larvae. The results of biochemical tests showed that the isolates belong to Bacillus thuringiensis. Isolates were different in pathogenicity. Bt5 isolate was the most efficient to kill the larvae of large wax moth (72.4 %), and significantly superior all other isolates (p ≤ 0.01). Bt1 isolate showed a significant difference with control but non-significant difference with Bt2, Bt3, Bt4, Bt6 and Bt7 isolates.


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Research summary
أجريت هذه الدراسة لتقييم فاعلية سبع عزلات محلية من بكتيريا Bacillus لمكافحة يرقات فراشة الشمع الكبيرة Galleria mellonella L. في مختبرات الهيئة العامة للبحوث العلمية الزراعية في دمشق، سوريا. تم جمع اليرقات المصابة من أقراص الشمع المخزنة، وعزلت البكتيريا من اليرقات الميتة أو التي ظهرت عليها أعراض مرضية. بعد تنمية البكتيريا على وسط T3، تم تحديد نوعها باستخدام اختبارات بيوكيميائية، والتي أظهرت أن العزلات تنتمي إلى Bacillus thuringiensis. أظهرت النتائج أن العزلة Bt5 كانت الأكثر كفاءة في قتل يرقات فراشة الشمع بنسبة 72.41%، متفوقة على جميع العزلات الأخرى. بينما أظهرت العزلة Bt1 فاعلية بنسبة 27.59%، وكانت هناك فروق معنوية بين بعض العزلات والشاهد. تشير النتائج إلى أن العزلات المحلية من B. thuringiensis يمكن أن تكون بديلاً فعالاً للمبيدات الكيميائية في مكافحة الآفات الحشرية، خاصة في الظروف البيئية المحلية.
Critical review
دراسة نقدية: تعتبر هذه الدراسة خطوة مهمة نحو استخدام المكافحة البيولوجية كبديل للمبيدات الكيميائية الضارة. ومع ذلك، هناك بعض النقاط التي يمكن تحسينها. أولاً، الدراسة تركزت فقط على يرقات فراشة الشمع الكبيرة، وكان من الممكن توسيع نطاق البحث ليشمل آفات حشرية أخرى. ثانياً، لم يتم اختبار العزلات في ظروف حقولية أو شبه حقولية، مما يجعل من الصعب تقييم فاعليتها في الظروف الطبيعية. ثالثاً، لم يتم التطرق إلى إمكانية إنتاج هذه العزلات بكميات تجارية وكيفية دمجها في برامج المكافحة المتكاملة. أخيراً، كان من الممكن تقديم تحليل أعمق للآليات البيوكيميائية التي تجعل العزلة Bt5 الأكثر فعالية.
Questions related to the research
  1. ما هي العزلة الأكثر كفاءة في قتل يرقات فراشة الشمع الكبيرة؟

    العزلة Bt5 كانت الأكثر كفاءة بنسبة 72.41%.

  2. ما هي الاختبارات التي استخدمت لتحديد نوع البكتيريا؟

    استخدمت اختبارات بيوكيميائية لتحديد نوع البكتيريا.

  3. هل كانت هناك فروق معنوية بين العزلات المختلفة؟

    نعم، كانت هناك فروق معنوية بين بعض العزلات والشاهد.

  4. ما هي التوصيات المستقبلية لتحسين الدراسة؟

    التوصيات تشمل توسيع نطاق البحث ليشمل آفات حشرية أخرى، اختبار العزلات في ظروف حقولية، وتحليل أعمق للآليات البيوكيميائية.


References used
Abbott, W.S. (1925). A method of computing the effectiveness of an insecticide. J. Econ. Entomol., 18: 265-267
Ararso, Z.; and G. Legesse (2016). Insecticidal action of honeybees propolis extract against larvae of lesser wax moth. Agriculture and Biology Journal of North. America. 7(6): 302-306
Bagdanov, S.; V. Kilchenmann; K. Seiler; H. Pfefferli; T. Frey; B. Roux; P. Wenk; and J. Noser (2004). Residues of paradichorobenzene in honey and bees wax. Journal of Apicultural Research. 43: 14-16
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