Rhizoctonia root rot
Rhizoctonia solanii
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Identification
This causes root rot in aloes and haworthias - the plant bodies then turn red.
In cacti it causes a brown rot, which is very rapid rot which starts from the stem base. It often affects seedlings. Growth can be retarded or stopped. Most prevalent in hot weather
Prevention
Don't overwater. Preventative drench twice a season with a fungicide containing thiophanate-methyl.Cure
Seedlings affected should be removed from the seed pan. The seed pan should be drenched with a fungicide, Captan, Chinosol or Benomyl.
Adult plants - cut off all affected parts, dust with sulphur and treat as a cutting.