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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).