Bui. 712, U. S. Dept of Agricultu 



Apple Powdery Mildew— III. 



Branch from a Jonathan tree, showing a terminal twig killed by the infection of the previous 

 year. Note that the petals are beginning to fall from the healthy blossoms on the lower por- 

 tion, while the blossoms from the infected buds near the terminal twig are not yet open. 



