Stem Rot on snake plant
What's Happening
Stem rot in snake plants is caused by aggressive fungal pathogens including Colletotrichum gloeosporioides, Fusarium oxysporum, and Alternaria alternata. These fungi colonize stem tissue through wounds or natural openings, causing tissue necrosis that appears as brown to black lesions at the stem base or crown. Pathogenicity tests demonstrate C. gloeosporioides is the most aggressive, covering 100% of stem surface in controlled inoculations. The disease spreads from infected plants via spores carried on wind, tools, or human activity.
How to Fix It
- 1
Immediate quarantine: isolate infected plant 6+ feet from others to prevent spore transmission
- 2
Surgical removal: sterilize tools with 10% bleach solution; cut affected tissue 3 inches below visible rot into healthy firm tissue
- 3
Apply cinnamon powder to cut surfaces immediately after excision - acts as natural antifungal barrier and promotes wound sealing
- 4
Chemical control: apply systemic fungicide Kemazed® at first sign of infection; shows consistent highest inhibition against C. gloeosporioides, F. oxysporum, and A. alternata in vitro
- 5
Biocontrol alternative: treat with Bacillus subtilis or Trichoderma harzianum which produce chitinases and glucanases that dissolve pathogen cell walls
- 6
If crown is compromised: propagate from healthy leaf cuttings before entire plant collapses
How to Prevent It
Sterilize all tools between plants with alcohol or bleach; maintain 40-50% humidity (not higher); ensure bright indirect light and strong air circulation; inspect new plants thoroughly before introducing to collection; treat both infected plants AND nearby asymptomatic plants as single population unit since spores spread easily
Related Problems
Same Problem on Other Plants
Go Deeper
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