A form of grape rot caused by the mould of the Penicillium expansum subgenus (pictured left). It is particularly favoured by warm, humid weather and prefers ripe berries that are already affected by botrytis, have broken seeds due to powdery mildew or have been damaged by harmful birds, wasps or mechanical damage (e.g. hail). The ripe berries turn greenish-grey and develop an initially white, later blue-green pustule-shaped spore system (picture on the right shows spores on a pear).
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