Effect of nutritional and physiological factors on Alternaria carthami causing leaf blight of safflower

Authors

  • S.S. WAGH, A.P. SURYAWANSHI*, SUNITA J. MAGAR and P.G. CHAVAN

Keywords:

Safflower, Alternaria carthami, mycelial growth, sporulation

Abstract

Present study was carried out to assess the effects of culture media, carbon and nitrogen sources, temperature, pH and light on the growth and sporulation of the test pathogen. Results revealed that, of the 14 culture media tested, highest average mycelial growth was observed on Potato dextrose agar (86.46 mm), followed by Oat meal agar (85.17 mm) and Richard’s agar (83.88 mm) with excellent sporulation. Among carbon sources tested, highest average mycelial growth was observed with Maltose (85.00 mm), followed by Glucose (83.46 mm) and Sucrose (83.21 mm). Of the nitrogen sources tested, Potassium nitrate (85.33 mm) gave highest average mycelial growth, followed by Sodium nitrate (74.04 mm) and Calcium nitrate (61.67 mm), with excellent sporulation. The test pathogen also exhibited differential response to pH levels, various temperature regimes and light durations. The pH range of 5.5 to 7.5 was found suitable for mycelial growth and sporulation of the test pathogen. Maximum average mycelial growth was found in the temperature range of 25-30°C (84.00 to 85.79 mm), followed by 20°C (73.88 mm) and 35°C (67.00 mm) and the temperature below 15°C and above 40°C was found non-congenial. The test pathogen could grew better with good sporulation under alternate dark and light (each for 12 hrs duration), followed by continuous dark.

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Issue

Vol. 69 No. 4s (2016): Indian Phytopathology : Special Issue

Section

Research Articles

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How to Cite

SUNITA J. MAGAR and P.G. CHAVAN, S. W. A. S. (2016). Effect of nutritional and physiological factors on Alternaria carthami causing leaf blight of safflower. Indian Phytopathology, 69(4s), 149-156. http://epubs.icar.org.in/ejournal/index.php/IPPJ/article/view/71259