Leaf drop on escallonia

QuestionsLeaf drop on escallonia
Pat McCaffrey Staff asked 14 years ago

I have a 30yd 7ft high erscollonia screening hedge. During the summer the leaves developed a black spot and turned partially yellow. Leaf drop then occurred and the hedge has now lost about 75% of its leaves. As I wish to mantain the screen, how can I get the leaves growing again?