ارزیابی کمی و تعیین رابطه‌ی بین وقوع و شدت بیماری پوسیدگی اسکلروتینیایی ساقه کلزا در استان مازندران

نوع مقاله: بیماری‌شناسی گیاهی

نویسندگان

1 گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه زابل، زابل.

2 دانشیار گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه زابل

3 بخش تحقیقات گیاهپزشکی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان گلستان، گرگان

4 دانشیار، گروه گیاهپزشکی دانشگاه زابل

5 گروه زیست شناسی، دانشگاه یزد

چکیده

پوسیدگی اسکلروتینیایی ساقه از بیماری‌های مهم کلزا در دنیا و ایران می‌باشد. با هدف اندازه‌گیری وقوع و شدت بیماری و تعیین رابطه‌ی بین آن‌ها، 240 مزرعه‌ی کلزا طی سال‎های 1390،1389، 1394 و 1395 در استان مازندران بررسی شد و در بازدیدهای هفتگی میزان بیماری در آن‌ها یادداشت شد. از لحاظ وقوع و شدت نهایی بیماری، بین مناطق و سال‌های تحقیق اختلاف معنی‌دار (P<0.01) وجود داشت. بیشترین مقدار وقوع و شدت (02/34 و 70/23 درصد) در سال 1395 و کمترین آن‌ها (85/12 و 32/6 درصد) در سال 1394 بود. بین مناطق نیز گلوگاه و ساری به‌ترتیب بیشترین و کمترین آلودگی به بیماری را داشتند. جهت تعیین رابطه‌ی بین دو کمیّت فوق، داده‌های مربوطه، از طریق تجزیه رگرسیون خطی با مدل‌های مختلف ریاضی برازش شد. براساس آماره‌هایی مانند ضریب تبیین (R2) و خطای استاندارد برآوردها، مدل‌های خطی، آلومتری و ریشه مربع، برازش خوبی با داده‌ها نشان دادند. مدل خطی با توجه به ساده‌تر بودن و داشتن پیچیدگی محاسباتی کمتر، به عنوان مدل نهایی انتخاب شد. از لحاظ شیب معادله‌ی مدل خطی، بین چهار سال تحقیق اختلاف معنی‌دار (P<0.01) مشاهده شد. معادله‌ی این مدل برای سال‌های 1389 و 1395 به‌صورت S=0.72(I)-0.99 و برای سال‌های 1390 و 1394 به‌صورت S=0.55(I)-0.61 بود. شرایط آب و هوایی تأثیر معنی‌داری روی مقدار آلودگی به‌بیماری در سال‌های مختلف داشت.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Quantitative assessment and determination the relationship between incidence and severity of rapeseed Sclerotinia stem rot disease in Mazandaran province

نویسندگان [English]

  • Rezapoor Mehdi Alamdarlou 1
  • Mohammad Salari 2
  • Mohammad Ali Aghajani 3
  • Naser Panjehkeh 4
  • Seyed KAZem Sabbagh 5
1 Department of plant protection, Faculty of Agriculture. Zabol university, Zabol
2 Associate Proferror of Plant protection, Faculty of Agriculture, university of zabol
3 Dept. of Plant Protection Research, Agriculture and Natural Resources Research and Education Center of Golestan Province, Gorgan
4 Associate Professor, Department of plant protection, college of Agriculture, Zabol University
5 Department of Biology, Campus of Science, Yazd University
چکیده [English]

Sclerotinia stem rot is a rapeseed important disease in the world and Iran. For measuring disease incidence and severity and determination relationship between them, 240 rapeseed fields were investigated in Mazandaran province during years 2010, 2011, 2015 and 2016, and their disease amounts recorded in weekly surveys. Based on final incidence and severity, there were significant differences (P<0.01) between regions and years. The highest incidence and severity (34.02 and 23.70 percent) was in year 2016 and the lowest of them (12.85 and 6.32 percent) in year 2015. Between regions, Galogah and Sari had the highest and lowest disease infection respectively. In order to determine relationship between two mentioned quantities, the related data, were fitted with different mathematical models by linear regression analysis method. Based on statistical analyses such as coefficient of determination (R2) and standard error of estimates, linear allometric and square root models had good fitness with data. The linear model was selected as the final model because of the simplicity and having low computational complexity. Based on slope of linear model equation, there was significant difference (P<0.01) between four years of investigation. The equation of the model for years 2010 and 2016 was S=0.72(I)-0.99 and for years 2011 and 2015 was S=0.55(I)–0.61. Weather conditions had significant effects on disease infection in different years. 

کلیدواژه‌ها [English]

  • Epidemiology
  • Rapeseed diseases
  • Severity
  • Incidence
  • Sclerotinia sclerotiorum

 

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