Cedar apple rust affects the foliage and fruit of apples (Malus domestica) and other members of the family Rosaceae (e.g. crabapple). This fact sheet describes the causal agent, the fungal pathogen, Gymnosporangium ...

Fire blight, caused by the bacterium Erwinia amylovora, is one of the most destructive diseases in apple and pear production. Fire blight can infect other members of the rose family including quince, juneberry, hawthorne, ...

Brown rot occurs on all stone fruit worldwide and afflicts blossoms, twigs, and fruit, both pre- and post-harvest. Several closely-related fungal species, collectively known as Monilinia spp. cause the disease. In stone ...

Apple scab, one of the most devastating fungal diseases of apple, occurs worldwide, wherever apples are grown. The fungal pathogen, Venturia inaequalis, can also infect crabapple, hawthorn, mountain-ash, firethorn, and loquat.

Blueberry shock disease, caused by Blueberry shock virus (BlShV), threatens profitable and sustainable blueberry (Vaccinium spp.) production. The disease has recently emerged in New York, having been confirmed in 2011. ...

Scorch is a viral disease that is a considerable threat to New York blueberry (Vaccinium spp.) production. Caused by Blueberry scorch virus (BlScV), the disease is spread through clonal propagation of infected plant ...

Plum pox is a viral disease of stone fruits first reported in Bulgarian plums in the 1910’s. More widely known around the world by its Slavic name, sharka, the disease first spread slowly through eastern Europe, gaining ...

Powdery mildew occurs in all apple-producing regions worldwide, especially where warm, humid climate conditions prevail. Young expanding plant tissues are particularly susceptible to the disease. Therefore, powdery mildew ...