ISSN 2756-3413
African Journal of Virology Research ISSN 3421-7347 Vol. 4 (7), pp. 001-006, July, 2010. © 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 Ravi1
1Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore- 641 003
2Department of Plant Pathology, Tamil Nadu Agricultural University, Madurai -625 104
Accepted 07 April 2010
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.