Three drops (each app. 30 μl) of a Plasmopara viticola sporangia suspension were added to the abaxial leaf surface at three intersections of main veins of each leaf covering an area of approximately 0.5 cm2.
Three drops (each app. 30 μl) of a Plasmopara viticola sporangia suspension were added to the abaxial leaf surface at three intersections of main veins of each leaf covering an area of approximately 0.5 cm2.