Abstract:
The effect of temperature. light, culture media and pH on the mycelial growth and sporulation
behaviours of Phomopsis vexans, causal organism of Phomopsis blight and fruit rot of eggplant
were studied in the laboratory. The pathogen grew best at 25°C, under 12112h cycle light and
pH 5.5 levels of culture media. Number of spores per millilitre was also maximum at 25°C
temperature, 12112h cycle light and at pH 5.5. Eggplant Fruit Extract Agar media gave the
maximum growth and sporulation of P. vexans. Two types of conidia, u (alpha) and [l (beta)
were detected in P. vexons. Five groups of isolates showed variation in growth and sporulation
under different levels of temperature, light, culture media and pH. Alpha and beta conidia
varied in size for live isolates groups. Existence of variation in isolates of P. vexans revealed the
existence of the variability of P. vexons occurs in Bangladesh.
