Scorch or Sunscald Fungus
Mycosphaerella spp.
Hendersonia opuntiae
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Identification
This disease is common and serious on prickly pear cactus (Opuntia). Spots at first are distinctly zoned, later enlarging until entire cladodes turn a reddish-brown and finally die. The center of the diseased area is greyish-brown and cracked. Other fungi may also be present in the diseased area.
Prevention
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