State of sheath blight in the rice fields of Mazandaran province

Subject Areas : دو فصلنامه تحقیقات بیماریهای گیاهی

F. Tavakkoli ¹ , M.A. Aghajani ² , H. Etebarian ³ , M. Rostami ⁴

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

Received: 2013-11-06 Accepted : 2013-11-06 Published : 2013-12-22

Keywords: Rhizoctonia solani, Rice, Disease state, disease incidence, Mean severity,

Abstract :

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.

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