Epidemiologial aspects responsible for the conidial germination of Erysiphe polygoni DC on green gram

Powdery mildew of green gram caused by Erysiphe polygoni DC has become major constraint in green gram growing areas. The germination of conidia was maximum at 20°C (70.31%) followed by at 15°C and 25°C. The temperature range of 15 to 25°C was the most congenial for conidial germination. The optimum temperature required for conidial germination was 20°C. The relative humidity of 80 per cent was found to be optimum for conidial germination (70.50%). Maximum germination of conidia was observed at 2.0 per cent dextrose solution (75.50%) at 24h after incubation. Very poor germination was recorded in sterile water compared to tap water.