Journal of Pure and Applied MicrobiologyVol. 6 No. 4

Physiological Studies of Drechslera State of Trichometasphaeria holmii Causing Leaf Spot/Blight of Heliconia

S.S. Kansara1*, D.M. Joshi2 and J.C. Dhingani3

1Department of Entomology, N.M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, India. 2Department of Plant Pathology, ASPEE College of Horticulture and Forestry, Navsari Agricultural University, Navsari, Gujarat, India. 3Agricultural Officer, Cotton Research Station, Kukada, Surendranagar, Junagadh Agricultural University, Junagadh, Gujarat, India.

Received on 03 April 2012 and accepted on 08 May 2012

 

ABSTRACT

Heliconia is generally known as “wild plantain” or “lobster’s claw”. Heliconias are grown for cut flower and landscape plants. Its brilliant colour, exotic form, long straight peduncles and excellent post harvest characteristics make it an outstanding flower for the florist’s trade. The leaf spot/ blight disease was observed in severe form on the Heliconia orthotricha var. she and Drechslera state of Trichometasphaeria holmii (Luttrell) Subramanian and Jain, was observed to be constantly associated with the disease. Under physiological studies eight synthetic and semi-synthetic media tested, Czapeck’s (Dox) agar, potato dextrose agar and Elliot’s agar were found to be the best solid media and potato dextrose broth, Richards’ broth, Czapeck’s broth, glucose asparagines broth and potato carrot sucrose broth were found the best liquid media for the growth and sporulation of the pathogen. The fungus grew and sporulated optimum under pH, ranging from 5.5 to 6.0. Out of nine nitrogenous sources tried sodium nitrate, ammonium phosphate, asparagines, ammonium sulphate and ammonium chloride proved to be the best for the growth and sporulation of the pathogen.

Keywords : Heliconia, Drechslera state of Trichometasphaeria holmii , Leaf spot/blight, Synthetic and Semi-Synthetic Media, pH, Nitrogen Sources