Table of Contents
Phoma
Description
Phomopsis is a fungal disease that presents as uniform circular patterns with raised brown to tan lesions, often surrounded by reddish-brown and distinctly defined border. Small black pinhead dots are pycnidia fruiting structures where the spores are produced. Phoma rarely grows to large size and is not necessarily centered on areoles. Can be an aggressive pathogen and thrives in humid, warm and wet conditions. 82 degrees F is optimal for growth.
Cultivation Notes
To treat and manage Phoma infections, the following chemical fungicides are recommended:
- Mancozeb: A broad-spectrum contact fungicide used to kill spores and control surface spread.
- Propiconazole 14.3: A systemic fungicide that provides internal protection and treatment. Note this product is not safe for food crops.
Community Discussion & Citations
The community discussion focused on diagnosing a problematic fungal infection on a cultivated cactus, resulting in a direct recommendation for chemical control.
| Date | Speaker | Confidence Score | Key Insight/Quote |
|---|---|---|---|
| 2026-04-13 | Dushi Kaunt | 6 | “This is Phoma/phomopsis you can treat with mancozeb or propiconazole 14.3. You can find both of these products on Amazon.” |
Credibility Notes
Dushi Kaunt was assigned a confidence score of 6/10 for providing specific, actionable chemical remedies (Mancozeb and Propiconazole 14.3) to address the pathogen. However, because there was no broader consensus or verification by established experts such as Gee Bee in the discussion, the score remains moderate.