Infected flowers exhibit water-soaked flecking on the petals or may become completely colonized and then collapse and turn brown. Flower blight frequently leads to colonization of the pedicel and stem. Leaves develop zonate lesions, and flower petals show tan spots and tip necrosis or are entirely blighted. B. cinerea may be seedborne in African daisy. Dieback of florist's geranium caused by Botrytis cinerea .
Losses are particularly high in vegetatively propagated P .
Stock plants are grown close together and have multiple branches and a dense canopy that is created with growth regulators in order to maximize cutting productivity. Consequently, lower leaves of stock plants typically senesce and become colonized by B. cinerea , resulting in a massive buildup of inoculum. B. cinerea infections may also develop at the cutting bases or at leaf scars during propagation under mist. Flower blight is common. Geraniums sometimes show ghost spots indicative of Botrytis lesions whose development has been arrested.