International Journal of Mycology and Plant Pathology

International Journal of Mycology and Plant Pathology Vol. 2 (2), pp. 108-111, February, 2016. © International Scholars Journals

Full Length Research Paper

Physiological and nutrition requirements for the determination of Alternaria helianthi in sunflower

Randhi M. E.1, K. K. Raj2 Maharaja E. A. 1 and Nkrimmah Ravi 1

1Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore- 641 003

2Department of Plant Pathology, Tamil Nadu Agricultural University, Madurai -625 104

*Corresponding author. E-mail: randhi.ja144@gmail.com.

Accepted 07 April 2014

Abstract

Ten isolates of Alternaria helianthi were collected from different sunflower growing areas of Tamil Nadu. Most isolates preferred pH levels of 6.96-7.15, temperature 29.22-33.93°C and incubation time of 24 h. The nutritional studies were taken up to know the best source of carbon and nitrogen required for the growth and sporulation of the fungus. Six different carbon sources tried, Glucose was found to be the best source of carbon for the growth and the seven different nitrogen sources tested, ammonium nitrate supported good growth and sporulation.

Key words: Sunflower, Alternaria helianthi, temperature, pH, incubation period, carbon and nitrogen sources.