fungal infection on Mammillaria
Quick answer
If your Mammillaria has fungal infection, the most likely cause is: Mammillaria cacti are particularly susceptible to fungal infections in humid indoor environments. The tubercle (nipple-like projections) structure creates micro-pockets where moisture accumulates. Fungi like Alternaria and Colletotrichum thrive in conditions above 60% humidity with poor air circulation, causing corky brown lesions or woolly white patches at tubercle bases.
Start here:
- 1. Identify fungal type: Corky brown spots = fungal; woolly white patches = mealybugs or fungal wool
- 2. Isolate infected plant immediately
Why Mammillaria gets fungal infection
Mammillaria cacti are particularly susceptible to fungal infections in humid indoor environments. The tubercle (nipple-like projections) structure creates micro-pockets where moisture accumulates. Fungi like Alternaria and Colletotrichum thrive in conditions above 60% humidity with poor air circulation, causing corky brown lesions or woolly white patches at tubercle bases.
How to reverse fungal infection on Mammillaria
- 1
Identify fungal type: Corky brown spots = fungal; woolly white patches = mealybugs or fungal wool
- 2
Isolate infected plant immediately
- 3
Remove affected tubercles with sterile blade if spots are localized
- 4
Apply copper-based fungicide (follow label dilution) or systemic fungicide for spread
- 5
Improve airflow with small fan and reduce humidity to 40-50%
Keep fungal infection off this Mammillaria
Maintain humidity below 50%. Position in bright indirect light with excellent air circulation. Water only at soil level - never mist or overhead water. Quarantine new plants for 2 weeks.