Amerodothis ilicis Bagnisiella ilicis Botryodiplodia juglandicola Botryosphaeria ambigua Diplodia griffonii Diplodia juglandicola Dothidea ilicis Eutypella juglandicola Melanops cupressi Melanops cydoniae Melogramma ambiguum Phoma obtusa Physalospora cupressi Physalospora cydoniae Physalospora malorum Physalospora obtusa Physalospora thyoidea Sphaeria ambigua Sphaeria cupressi Sphaeria eunotiaespora Sphaeria juglandicola Sphaeria obtusa Sphaeria thyoidea Sphaeropsis malorum Valsa juglandicola Wallrothiella eunotiaespora Botryosphaeria obtusa is a plant pathogen that causes frogeye leaf spot, black rot and cankers on many plant species.

In fruit such as the apple, cranberry and quince, it is referred to as black rot, and in twigs and trunks it causes cankers.

[1] Black rot Botryosphaeria obtusa enters the fruit through wounds.

[3] These then enlarge to cause large spots on the leaf, developing a brown color.

The spots can then produce pycnidia which can separate this species of fungus from other possible leaf fungi.