cactus disease dry root rot caused by fungi, severe damage fungi infected gymnocalycium cactus

anthracnose argriculture background botanic botanical botany cactaceae cacti cactus collection color cultivation cutting decease decoration decorative desert disease dry environment flora floral flower flowerpot fungi garden globular grafting green grow growth gymno gymnocalycium hobby house isolated natural nature plant pot propagation root rot scion sharp small spike stem thorn tree white