In the set-up for determination of uredinium size and density,
10 pots, each with two plants, were used per treatment and an
adaxial area of 2 cm approximately 11 cm below the tip of the
second leaf was inoculated. For assessment of uredinium size
and uredinium density, one inoculated leaf segment was cut off
per pot 16 days after inoculation and prepared for microscopy.