بررسی وضعیت بیماری سوختگی غلاف برنج در شالیزارهای استان مازندران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد گروه بیماری شناسی گیاهی پردیس ابوریحان، دانشگاه تهران

2 استادیار پژوهش، بخش تحقیقات گیاهپزشکی، مرکز تحقیقات کشاورزی و منابع طبیعی استان گلستان، گرگان

3 استاد گروه بیماری شناسی گیاهی پردیس ابوریحان، دانشگاه تهران.

4 مربی پژوهش، بخش گیاهپزشکی، معاونت موسسه تحقیقات برنج کشور، آمل

چکیده

       سوختگی غلاف که به­وسیله­ی قارچ Rhizoctonia solani AG1-IA ایجاد می­شود، یکی از بیماری­های مهم برنج در استان­های شمالی ایران، از جمله استان مازندران می­باشد. جهت بررسی وضعیت آلودگی مزارع استان، طی دو سال زراعی1387و 1388، تعداد 53 مزرعه در پنج شهرستان آمل، ساری، قائم شهر، سوادکوه و بهشهر مورد ارزیابی قرار گرفت. تجزیه و تحلیل آماری داده­های بیماری، بر اساس درصد بوته­های آلوده(I) و شدت متوسط بیماری (S (ارتفاع لکه­های ناشی از بیماری نسبت به ارتفاع گیاه) و  S2(تعداد پنجه بیمار نسبت به تعداد کل پنجه­های گیاه بیمار))در هر مزرعه انجام گردید. نتایج نشان داد که اختلاف آلودگی مزارع در پنج منطقه­ی مورد بررسی، از لحاظ وقوع و شدت، کاملاً معنی­دار (01/0 P <) بود. کمترین و بیشترین مقدار متوسط بیماری در بهشهر برای درصد وقوع (I) و شدت متوسط بیماری (S و S2)، به­ترتیب برابر 92/10، 55/6 و 9/9 درصد و در آمل برابر 87/42، 66/28 و 99/34 درصد مشاهده گردید.

کلیدواژه‌ها

عنوان مقاله [English]

State of sheath blight in the rice fields of Mazandaran province

نویسندگان [English]

  • F. Tavakkoli 1
  • M.A. Aghajani 2
  • H. Etebarian 3
  • M. Rostami 4
چکیده [English]

Sheath blight, caused by Rhizoctonia solani AG1-IA, is an important disease of rice in Northern provinces of Iran, including Mazandaran. In order to study the status of the disease in the province, 53 fields in 5 regions (Amol, Sari, Qaemshahr, Savadkuh and Behshahr) were evaluated during 2008 and 2009 seasons. Statistical analyses of disease data were performed based on disease incidence (I), mean severity (S), (Lesion height / plant height) and (S2), (Number of diseased tillers / number of tillers in a diseased hill) of the fields. The results revealed that the regions were significantly different based on the I, S and S2 (P<0.01). Minimum and maximum of disease amounts were observed in Behshahr (with I, S and S2 values of 10.92, 6.55 and 9.9 %,) and in Amol (with I, S and S2 values of 42.87, 28.66 and 34.99 %,) respectively.

کلیدواژه‌ها [English]

  • Rhizoctonia solani
  • Rice
  • Disease state
  • disease incidence
  • Mean severity

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