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Plantwise Technical Factsheet

almond scab (Venturia carpophila)

Host plants / species affected
Prunus (stone fruit)
Prunus armeniaca (apricot)
Prunus domestica (plum)
Prunus dulcis (almond)
Prunus persica (peach)
Prunus salicina (Japanese plum)
Pyrus communis (European pear)
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).

Related treatment support
 
External factsheets
University of California Afghan Agriculture Factsheets, University of California, 2012, English language
Ohio State University Extension Fact Sheets, The Ohio State University Extension, 2008, English language
University of California IPM Pest Management Guidelines, University of California, 2009, English language
University of California IPM Pest Management Guidelines, University of California, 2010, English language
Ontario CropIPM factsheets, Ontario Ministry of Agriculture, Food and Rural Affairs, Canada, 2015, English language
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