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 ...

The rosy apple aphid (RAA) can be found throughout the apple growing regions of North America. In the spring, the aphids feed on apple leaves and fruits, and in the summer move to alternate hosts, such as narrow-leaved ...

The grape cane girdler is one of two Ampeloglypter species which can attack new shoot growth in the spring. It has been reported from throughout the midwestern and eastern United States. Originally this species was described ...

The white apple leafhopper (WALH) is native to and widely distributed throughout the apple growing regions of North America. The WALH has 2 generations a year and overwinters in the egg stage.

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.

The black stem borer is an introduced species from eastern Asia that first was detected in NY in greenhouse-grown grape stems in 1932, but has since been documented in most parts of the US. A member of the group known as ...

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 ...

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, ...

Apple chlorotic leaf spot virus (ACLSV) infects pome and stone fruits. It can elicit diverse symptoms although, in most cultivars the virus is latent, which means that infected trees do not manifest observable symptoms. ...

Grape tumid galls, also called grape tomato galls, are caused by larvae of a small fly known as the grape tumid gallmaker (GTG). This pest is native to the northeastern United States and southeastern Canada. It infests ...