Root Rot

Overwatering

To address root rot in Haworthia coarctata, first, cease watering immediately and allow the soil to dry out. If the plant is severely affected, unpot it and remove any mushy, black roots with a sterile instrument, then repot into fresh, well-draining soil. Ensure the pot has adequate drainage holes. Going forward, water only when the soil is completely dry, and avoid letting the plant sit in water.

Mealybug Infestation

Pseudococcidae family

Mealybugs can be a significant problem for Haworthia coarctata, manifesting as cotton-like masses on the plant. To combat this, first isolate the affected plant to prevent spread. Use a cotton swab dipped in alcohol to dab directly onto the pests, effectively killing them without harming the plant. For severe infestations, applying a systemic insecticide or neem oil can be effective. Ensure to follow the product's instructions carefully and repeat the treatment as necessary to eradicate the pests completely.

Root Rot

Fungal Infection

Root rot in Haworthia coarctata, often not directly caused by pests or overwatering, can stem from a fungal infection in the soil. To combat this, remove the plant from its pot, trim away any black, mushy roots, and treat the remaining healthy roots with a fungicide. Repot the plant in fresh, sterile potting mix and ensure the pot has adequate drainage. Avoid watering the plant until the topsoil is dry to touch, and ensure it receives good airflow to prevent future occurrences.