About Podosphaera leucotricha (Ellis & Everh.) E.S.Salmon
This fungus, Podosphaera leucotricha, forms a white, thin to dense coating on leaves, shoots, fruits, stalks, flowers, and buds. Podosphaera leucotricha is one of the most significant pathogens affecting cultivated apple across the globe. Its main host genera are Malus and Pyrus. In the past, it has been reported from a range of other host genera including Cydonia, Photinia, Prunus, and Spiraea, with varying degrees of certainty for these reports. Infected plants have reduced photosynthesis and transpiration, which leads to decreased overall growth. Infected blossom may become deformed, and shoots become stunted, with infected leaves falling earlier than healthy leaves.
