Charcoal Spot
(fungus - Stevensea (Diplotheca) wrightii)
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Identification
Charcoal spot is a destructive disease of Opuntia. Small spots, usually one-quarter inch or more in diameter, appear first. The spots are surrounded by a ring of small raised dots that are the fruiting structures. Spots later enlarge, but remain separated.Prevention
As always, good greenhouse hygeine and making sure only healthy plants are introduced to the collection