1. Botryosphaeria obtusa (fungal pathogen)
Likelihood: HighA fungal pathogen that produces spores on infected leaves and twig lesions; spores are splashed by rain to young leaves in spring, causing primary infections that seed later infections.
Identification
- remove_circle_outlineSpring spotting on newly emerged leaves with purple-brown margins and tan centers
- remove_circle_outlineYellow halos surrounding lesions on the upper leaf surface
- remove_circle_outlineBlack specks or small fruiting bodies may be visible on older lesions
- remove_circle_outlineLook for twig lesions or cankers later in the season on heavily infected branches
