Phomopsis cane and leaf spot is more severe in grape-growing regions characterized by a humid temperate climate through the growing season.

[1] Phomopsis cane and leaf spot is a disease that causes symptoms in the common grapevine species, Vitis vinifera, in many regions of the world.

Small, black spots on the internodes at the base of developing shoots are probably the most common disease symptom.

[5] Soil moisture and temperature can impact the severity of symptoms, leading to a systemic infection in warm and wet conditions.

Bubák (teleomorph: Diaporthe Nitschke) is a cosmopolitan fungal genus that contains both plant pathogens and endophytes described from a wide range of annual and perennial hosts, including economically important crops.

[4] The teleomorph stage of the disease cycle does not occur in nature and involves sexual combination of the antheridium with the ascogonium to produce ascospores, allowing for genetic variation.

[8] During favorable conditions, conidia are released from infected lesions on the leaves or fruit and dispersed to other plants through rainfall or wind.

Fungal pathogens depend on moist conditions, causing the intensity of disease outbreaks to increase in wet environments.

The fungus also attacks many other hosts such as cherry trees, most other Prunus species, as well as apples, pears and walnuts.