Conidial germination and appressorial formation of the plant pathogenic fungi on the coverglass or cellophane coated with various lipid components of plant leaf waxes.

The surface of a plant is covered with a complex mixture of lipids, often in a crystalline form, called wax.'The most prominent components are alkanes, alkyl esters, fatty alcohols and fatty acids.Ketones, secondary alcohols, hydroxyfatty acids, aldehydes and terpenes have also been found.