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Survey of Plant-Parasitic Nematodes Associated with Cotton crop in Syria

تقصي انتشار النيماتودا المتطفلة المرافقة لنبات القطن في سورية

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 Publication date 2010
  fields Plant Protecion
and research's language is العربية
 Created by Shamra Editor




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A survey was conducted to determine the frequency and mean densities of plant-parasitic nematodes associated with cotton crop (Gossypium hirsutum L.) after the harvesting season 2008 in Syria. Results showed that twelve genera of plant-parasitic nematodes were found associated with cotton crop roots. The distribution of nematode genera varied between the Syrian governorates, Pratylenchus spp., Meloidogyne spp. and Rotylenchulus infect most cotton fields in all syrian governorates. The distribution was relatively uniform between the governorates. They occurred in 80.7%, 46.6% and 32.95%, respectively, of tested fields with an average density of 137.2, 59.6 and 574.3 juveniles/100 cm3 soil, respectively. meanwhile, the genus Tylenchorhynchus was found in central region only. Rotylenchulus was more prevalent in the heavier soils, but Meloidogyne. was not influenced by soil type. The other nematode genera detected in this survey were less frequent, their frequency of occurrence were for Hoplolaimus (19.3%), Scutellonema (31.8%), Tylenchorhynchus (31.8%), Helicotylenchus (30.7%), Rotylenchus (36.4%), Tylenchus (18.2%), Xiphinema (3.4%).


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Research summary
أجريت دراسة مسحية لتحديد تردد وكثافة الديدان الطفيلية النباتية المرتبطة بمحصول القطن (Gossypium hirsutum L.) بعد موسم الحصاد لعام 2008 في سوريا. أظهرت النتائج وجود اثني عشر جنسًا من الديدان الطفيلية النباتية مرتبطة بجذور القطن. تباين توزيع أجناس الديدان بين المحافظات السورية، حيث كانت أجناس Pratylenchus spp. وMeloidogyne spp. وRotylenchulus spp. الأكثر انتشارًا في معظم حقول القطن في جميع المحافظات السورية. وُجدت هذه الأجناس بنسبة 80.7% و46.6% و32.95% على التوالي في الحقول المختبرة، بمتوسط كثافة بلغ 137.2 و59.6 و574.3 يرقات/100 سم3 من التربة على التوالي. بينما وُجد جنس Tylenchorhynchus فقط في المنطقة الوسطى. كان جنس Rotylenchulus أكثر انتشارًا في التربة الثقيلة، في حين لم يتأثر جنس Meloidogyne بنوع التربة. كانت الأجناس الأخرى من الديدان الطفيلية النباتية التي تم اكتشافها في هذه الدراسة أقل تكرارًا، حيث كانت نسبة تواجدها كالتالي: Hoplolaimus (19.3%)، Scutellonema (31.8%)، Tylenchorhynchus (31.8%)، Helicotylenchus (30.7%)، Rotylenchus (36.4%)، Tylenchus (18.2%)، Xiphinema (3.4%).
Critical review
دراسة نقدية: تعتبر هذه الدراسة ذات أهمية كبيرة لفهم توزيع وكثافة الديدان الطفيلية النباتية المرتبطة بمحصول القطن في سوريا. ومع ذلك، يمكن توجيه بعض الانتقادات البناءة لتحسين البحث المستقبلي. أولاً، كان من المفيد تضمين تحليل أكثر تفصيلاً لتأثير العوامل البيئية الأخرى مثل درجة الحرارة والرطوبة على توزيع الديدان الطفيلية. ثانيًا، يمكن تحسين الدراسة من خلال تضمين بيانات عن تأثير هذه الديدان على إنتاجية القطن وجودته. أخيرًا، يمكن أن تكون الدراسة أكثر شمولية إذا تم تضمين مقارنات مع دراسات مشابهة في مناطق أخرى من العالم لتحليل الفروقات والتشابهات في توزيع الديدان الطفيلية النباتية.
Questions related to the research
  1. ما هي الأجناس الثلاثة الأكثر انتشارًا من الديدان الطفيلية النباتية في حقول القطن السورية؟

    الأجناس الثلاثة الأكثر انتشارًا هي Pratylenchus spp. وMeloidogyne spp. وRotylenchulus spp.

  2. في أي منطقة وُجد جنس Tylenchorhynchus فقط؟

    وُجد جنس Tylenchorhynchus فقط في المنطقة الوسطى.

  3. ما هو تأثير نوع التربة على انتشار جنس Rotylenchulus؟

    كان جنس Rotylenchulus أكثر انتشارًا في التربة الثقيلة.

  4. ما هي نسبة تواجد جنس Xiphinema في الحقول المختبرة؟

    كانت نسبة تواجد جنس Xiphinema في الحقول المختبرة 3.4%.


References used
Anter, E. A.; M. M. M. Abd-Elgawad and M. Hammad. (1993). A population and distribution survey of cotton nematodes in Egypt. Bulletin of Faculty of Agriculture, University of Cairo. Vol.44. No.4: 907-917
Asmus, G. L. (2004). Occurrence of Plant-Parasitic Nematodes in Cotton Crops in Mato Grosso Do Sul State, Brazil. Nematologia Brasilerira: 6
Colyer, P. D.; T. L. Kirkpatrick; W. D. Caldwell and P. R. Vernon. (2000). Root-knot nematode reproduction and root galling severity on related conventional and transgenic cotton cultivars. Journal of Cotton Science. Vol.4. Issue. 4: 232-236
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