Shothole-disease of stone fruit trees - Stigmina carpophila
Symptoms / species
Impact / measures
Red spots on the leaves, showing a sharp border, later on changing to brown and falling out, leaving a hole of about 1mm in size; on the shoots reddish bark necroses, several cm in length; sometimes also gummosis (gum-flux); on the fruits sunken spots, later on holes resembling feeding-damage.
Affected tree species
Leaf; Stem; Shoot/Twig/Branch;
This asexual microfungus tends to epidemic spread in cool and rainy weather, causing loss of fruits; repeated epidemics may weaken young trees or (rarely) kill them.
Curative measures In nurseries, orchards or on ornamental trees use of fungicides in spring (see federal register of plant protection). As a preventive measure infested leaves as well as fruit-mummies should be removed in autumn.