Botryosphaeria ribis is an ascomycete plant pathogen that primarily affects woody hosts in a number of temperate and tropical regions.

The susceptible hosts include a number of economically important plants such as apple, peach, almond, banana, and walnut trees, among others.

[1] On healthy leaves, the necrosis begins apically at the margins, extending back along the midrib, occasionally reaching the base and causing complete blight of the leaf.

[4] Within the host, the pathogen develops groups of perithecia under the dermal layer, which eventually rupture through, releasing ascospores to disseminate by wind.

[1] By August or September, the asexual stage is also active in the production of pycnidia, which provide a second means of inoculum through conidia.