Epidemiological and Nutritional factors on growth of Colletotrichum gloeosporioides (Penz.) Penz. and Sacc.

Studies were conducted to find out the favourable conditions and nutritional factors on the growth and conidial germination of C. gloeosporioides irr vitro. The temperature of 25°C was found to be good for the mycelial growth (89.6mm) and conidial germination (69%) of C. gloeosporioides. At 100% relative humidity, the mycelial growth (90mm) and conidial germination (87%) was higher. In this context, different light period were tested, continuous light favoured the both mycelial growth and conidial germination of pathogen. Among the ten culture media tested, potato dextrose agar was found to be best for mycelial growth (84.8mm), mycelial dry weight (625.4mg) and acervuli production of C. gloeosporioides. With regard to different carbon and nitrogen sources tested, the pathogen produced maximum mycelial growth and mycelial ary weight when basal medium was supplemented with manitol (79.5mm & 590.8mg) as a carbon source and ammonium nitrate (86.6mm & 680.8 mg) as a nitrogen source.