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Species Page

almond scab

Venturia carpophila

Distribution

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Host plants / species affected

Main hosts

show all species affected
Prunus (stone fruit)
Prunus persica (peach)
Prunus salicina (Japanese plum)

List of symptoms / signs

Fruit - gummosis
Fruit - lesions: black or brown
Fruit - malformed skin
Leaves - abnormal leaf fall
Leaves - necrotic areas
Stems - canker on woody stem

Symptoms

In peach (Prunus persica), the conidial stage of the fungus attacks fruit, causing small, circular, olive to brown spots on its surface. These coalesce, forming large, dark-brown areas and hindering normal fruit development. The infected skin cracks and becomes distorted, seeping gum. The fruit is unmarketable as it ripens unevenly, has a thick skin and poor flavour. Lesions may form on the underside of leaves and along the midrib. Small, brown, raised lesions appear on twigs and shoots, which may have a slightly raised purple margin (Sivanesan, 1974; Diekmann and Putter, 1996).

On almond (Prunus dulcis), spots develop on the hulls and leaves, which can cause premature defoliation (Connell, 2002).