Hemileia vastatrix can differentiate appressoria in vitro in oil:collodion membranes.
In vitro appressoria differentiate at similar rates as in planta appressoria.
Nail polish replicas can remove intact appressoria from coffee leaf surface.
Polish-collected appressoria RNA is of good quality and suitable for cDNA synthesis.
cDNA from polish-collected appressoria can be used for transcriptomic analyses.