Shot hole disease control in Almonds—by into overhead sprinklers

THE SOLID-SET, over-tree multiple-use irrigation system in almonds was evaluated during 1972 and 1973 for its usefulness in the application of chemicals for control of shot hole disease caused by the pathogen Coryneum beijerinkii. This fungus attacks leaves, fruit and twigs, resulting in leaf and fruit drop. Under severe circumstances it may cause the hulls to gum internally, affecting kernel quality. Prolonged wet weather in spring enhances disease development and sprinkler-applied water further favors spread. Well-timed chemical sprays will normally give adequate control.