(iii) Extraction of spores from lesions found on nondisinfected leaves: Leaves with more than three false mildew
lesions were randomly selected and placed on Petri dishes containing 20 mL of agar base. After 48 h, the characteristic
colonies of Ramularia genera were identified according to the description of Huerta-Espino et al. (2006). Later, 5 mL of
Tween 20 (0.01% v v-1), were poured onto the plate and spores were scrapped off the plate using a glass rod. The 5 mL water volume containing the spore suspension was distributed in Eppendorf vials (1 mL each) until further use. From each
suspension, 50 mL aliquots were taken and entirely used to inoculate the culture media. Afterwards, they were distributed
over the surface of the culture medium with a sterile glass rod and incubated to observe the development of fungal colonies in center and periphery of spot leaf.