Effect of spore concentration, light and relative humidity on spore germination and germ tube growth of Corynespora cassiicola (Berk. and Curt.) Wei

Maximum spore germination of Corynespora cassiicola was obtained with the spore concentration of 125 spores/ml. In general spore germination increases with the decrease of spore concentration. Incubation of spores under alternate darkness and light resulted in maximum spore germination (91.2%) and germ tube growth (131.3 μm) followed by incubation of spores in continuous light and continuous darkness. Spores germinated over a range of 75–100% relative humidity and maximum spore germination (95.5%) and germ tube growth (187 μm) was observed at 95% relative humidity.