Erysiphe necator var. necator A, B, C: Infected leaves of Vitis vinifera (JP#3, SA01, SK17), D: Infection under stereomicroscope, E: A Chasmothecium, F: An uncinuate appendage, G: Conidiophores, H: Foot cell along with shorter cells, I: A Conidium, J–K: Germinating conidia, L: Appressoria. Scale bars: A–C = 5 cm, D = 3 mm, E–F = 48 μm, G = 10 μm, H = 7 μm, I = 17 μm, J–K = 19 μm, L = 4 μm.